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Date: Wed, 17 Jan 2018 19:07:15 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Mauro Carvalho Chehab <mchehab@...pensource.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Levin Alexander <alexander.levin@...izon.com>,
Peter Zijlstra <peterz@...radead.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Hannes Frederic Sowa <hannes@...essinduktion.org>,
"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
Wanpeng Li <wanpeng.li@...mail.com>,
Dmitry Safonov <dima@...sta.com>,
Thomas Gleixner <tglx@...utronix.de>,
Eric Dumazet <edumazet@...gle.com>,
Radu Rendec <rrendec@...sta.com>,
Ingo Molnar <mingo@...nel.org>,
Stanislaw Gruszka <sgruszka@...hat.com>,
Paolo Abeni <pabeni@...hat.com>,
Rik van Riel <riel@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>,
David Miller <davem@...emloft.net>
Subject: Re: [RFC PATCH 0/5] softirq: Per vector threading v2
Hi Mauro,
On Wed, Jan 17, 2018 at 02:56:20PM -0200, Mauro Carvalho Chehab wrote:
> Em Tue, 16 Jan 2018 05:40:35 +0100
> Frederic Weisbecker <frederic@...nel.org> escreveu:
>
> > So this set is in a testable state. I addressed preliminary reviews from
> > Eric Dumazet, Paolo Abeni and Linus.
> >
> > You may want to play with MAX_SOFTIRQ_RESTART value, which is now the
> > number of calls allowed for a vector in a jiffy frame before it gets
> > queued to the workqueue. I set it to the arbitrary value of 20 which is
> > likely too low.
> >
> > Also I'm not sure about the last patch. For example in the usecase of
> > Dmitry Safonov it may be better not to apply it. I guess only testing
> > and reviews can tell.
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> > softirq/thread
> >
> > HEAD: 5a4c02b25bdcd853e3874d5319492ea6097f6e70
> >
> > Thanks,
> > Frederic
> > ---
> >
> > Frederic Weisbecker (5):
> > softirq: Account time and iteration stats per vector
> > softirq: Per vector deferment to workqueue
> > softirq: Defer to workqueue when rescheduling is needed
> > softirq: Replace ksoftirqd with workqueues entirely
> > softirq: Reset vector call counter before workqueue completion
> >
> >
> > Documentation/RCU/stallwarn.txt | 4 +-
> > include/linux/interrupt.h | 7 +-
> > kernel/sched/cputime.c | 12 +--
> > kernel/sched/sched.h | 4 +-
> > kernel/softirq.c | 232 +++++++++++++++++++++++++---------------
> > net/ipv4/tcp_output.c | 5 +-
> > 6 files changed, 161 insertions(+), 103 deletions(-)
>
> Hi Frederic,
>
> As reported on a separate thread:
> http://lkml.iu.edu/hypermail/linux/kernel/1801.1/00110.html
>
> The current approach taken since Kernel 4.9 by this patch:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4cd13c21b207e80ddb1144c576500098f2d5f882
>
> Broke applications that record a digital TV channel.
>
> The bug is easily reproductible on RPi3 with LibreELEC and tvheadend (with
> both RPi downstram Kernel and with upstream Kernel 4.15-rc7).
>
> Your patchset seems to be better addressing the softirq needs, by only
> deferring processing when really needed, instead of always doing it.
>
> I'm now testing if it fixes the issues with the media subsystem.
>
> All tests below were done on a Raspberry Pi3 with a SanDisk Extreme U3 microSD
> card with 32GB and a DVBSky S960C DVB-S2 tuner with an external power supply,
> connected to a TCP/IP network via Ethernet (with uses USB on RPi). It also
> have a serial cable connected to it.
>
> On both systems, I'm running Kernel 4.15-rc7 + your
> patches from this branch:
> https://git.linuxtv.org/mchehab/experimental.git/log/?h=softirq_fixup
>
> TEST 1: Raspbian with v4l-utils
> ===============================
>
> I booted RPi3 on a raspbian partition and installed v4l-utils from its
> git tree.
>
> I added support at v4l-utils[1] to parse MPEG-TS continuity sequence number
> on monitor mode.
>
> [1] https://git.linuxtv.org/v4l-utils.git/
>
> Before testing on RPi3, I double-checked the new discontinuity detector
> several times on an i7core machine, to be sure that it won't be
> producing false alarms, while it would be detecting and reporting
> discontinuities when they happens.
>
> On my tests, it is recording MPEG-TS data at ~60Mbits/s.
>
> On this test, it seems that your patchset addresses the issue.
>
> This is the results with your patchset and CONFIG_HZ=100:
>
> $ rm out.ts; dvbv5-zap -l universal -c ~/vivo-channels.conf NBR -m -X 300 -t 300 -o out.ts 2>errors
>
> 62.67s: Starting capture
> 206.82s: pid 2064, expecting 1 received 6
> 362.70s: Stopping capture
>
> PID FREQ SPEED TOTAL
> 18 1439.01 p/s 2113.5 Kbps 79260 KB
> 1901 933.19 p/s 1370.6 Kbps 51400 KB
> 1911 1250.57 p/s 1836.8 Kbps 68881 KB
> 1921 1280.59 p/s 1880.9 Kbps 70534 KB
> 1931 1382.41 p/s 2030.4 Kbps 76143 KB
> 1941 837.57 p/s 1230.2 Kbps 46133 KB
> 1951 531.91 p/s 781.2 Kbps 29297 KB
> 1961 531.91 p/s 781.2 Kbps 29297 KB
> 1971 866.72 p/s 1273.0 Kbps 47738 KB
> 1991 1187.88 p/s 1744.7 Kbps 65428 KB
> 2001 784.59 p/s 1152.4 Kbps 43214 KB
> 2011 770.16 p/s 1131.2 Kbps 42420 KB
> 2031 1925.98 p/s 2828.8 Kbps 106082 KB
> 2041 851.09 p/s 1250.0 Kbps 46877 KB
> 2051 812.99 p/s 1194.1 Kbps 44779 KB
> 2061 847.85 p/s 1245.3 Kbps 46699 KB
> 2071 1416.26 p/s 2080.1 Kbps 78007 KB
> 2081 1411.99 p/s 2073.9 Kbps 77771 KB
> 2091 531.91 p/s 781.2 Kbps 29297 KB
> 2101 531.91 p/s 781.2 Kbps 29297 KB
> 2111 1287.53 p/s 1891.1 Kbps 70917 KB
> 2131 845.45 p/s 1241.8 Kbps 46567 KB
> 2141 870.95 p/s 1279.2 Kbps 47971 KB
> 2151 2451.17 p/s 3600.2 Kbps 135009 KB
> 2161 854.14 p/s 1254.5 Kbps 47045 KB
> 2171 1211.97 p/s 1780.1 Kbps 66754 KB
> 2191 7313.75 p/s 10742.1 Kbps 402837 KB
> 8191 751.47 p/s 1103.7 Kbps 41390 KB
> OTHER 3793.81 p/s 5572.2 Kbps 208961 KB 1 continuity errors
> TOT 39506.70 p/s 58025.5 Kbps 2176006 KB
>
> Lock (0x1f) Signal= -66.52dBm C/N= 14.31dB postBER= 0
>
> Having just a single continuity error on 300 seconds seems acceptable
> (and it could be unrelated to Kernel handling).
>
> TEST 2
> ======
>
> I booted a partition with LibreELEC 8.2.2 and tvheadend backend.
>
> I'm recording one MPEG-TS service/"channel" composed of one audio and
> one video stream, while playing the same video twice via network,
> using VLC.
>
> The total traffic collected by tvheadend was about 4 Mbits/s
> (audio+video+EPG tables). It is part of a 58 mbits/s MPEG Transport
> stream, with 23 TV service/"channels" on it.
>
> On LibreELEC, I'm now seeing those logs, just after boot:
>
> [ 9.262681] usb 1-1.4: DVB: adapter 0 frontend 0 frequency 0 out of range (950000..2150000)
> [ 9.330306] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xC1E1
> [ 13.282765] NOHZ: local_softirq_pending 08
> [ 13.331928] NOHZ: local_softirq_pending 08
> [ 13.480830] NOHZ: local_softirq_pending 08
> [ 13.531364] NOHZ: local_softirq_pending 40
> [ 13.820693] NOHZ: local_softirq_pending 08
> [ 13.868430] NOHZ: local_softirq_pending 08
> [ 14.088503] NOHZ: local_softirq_pending 08
> [ 16.137247] NOHZ: local_softirq_pending 08
>
> I ran libreELEC for about one hour there, and got those errors:
>
> Jan 17 15:42:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 3)
> Jan 17 15:44:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 5)
> Jan 17 15:44:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 1)
> Jan 17 15:45:11 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 6)
> Jan 17 15:45:21 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 2)
> Jan 17 15:45:25 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 8)
> Jan 17 15:45:59 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 10)
> Jan 17 15:45:59 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 5)
> Jan 17 15:47:39 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 11)
> Jan 17 15:47:39 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 6)
> Jan 17 15:49:56 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 12)
> Jan 17 15:50:07 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 13)
> Jan 17 15:50:33 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 14)
> Jan 17 15:50:35 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 7)
> Jan 17 15:50:46 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 16)
> Jan 17 15:50:46 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 8)
> Jan 17 15:51:06 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 17)
> Jan 17 15:54:14 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 18)
> Jan 17 15:54:14 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 9)
> Jan 17 15:58:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 21)
> Jan 17 15:58:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 10)
> Jan 17 15:59:00 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 22)
> Jan 17 16:01:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 23)
> Jan 17 16:01:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 11)
> Jan 17 16:02:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 24)
> Jan 17 16:02:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 12)
> Jan 17 16:02:23 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 25)
> Jan 17 16:03:03 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 26)
> Jan 17 16:03:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 28)
> Jan 17 16:04:24 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 29)
> Jan 17 16:04:24 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 13)
> Jan 17 16:07:42 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 30)
> Jan 17 16:08:52 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 31)
> Jan 17 16:09:20 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 32)
> Jan 17 16:09:21 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 14)
> Jan 17 16:10:30 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 34)
> Jan 17 16:11:02 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 35)
> Jan 17 16:11:02 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 15)
> Jan 17 16:13:31 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 37)
> Jan 17 16:14:01 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 38)
> Jan 17 16:14:29 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 39)
> Jan 17 16:18:58 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 40)
> Jan 17 16:18:58 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 16)
> Jan 17 16:19:19 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 41)
> Jan 17 16:19:43 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 42)
> Jan 17 16:19:43 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 17)
> Jan 17 16:20:19 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 43)
> Jan 17 16:20:19 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 18)
> Jan 17 16:20:39 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 19)
> Jan 17 16:21:41 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 44)
> Jan 17 16:22:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 45)
> Jan 17 16:22:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 20)
> Jan 17 16:22:18 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 46)
> Jan 17 16:25:18 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 47)
> Jan 17 16:25:18 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 21)
> Jan 17 16:25:58 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 48)
> Jan 17 16:26:14 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 49)
> Jan 17 16:26:14 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 22)
> Jan 17 16:26:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 50)
> Jan 17 16:26:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 23)
> Jan 17 16:27:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 51)
> Jan 17 16:28:03 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 52)
> Jan 17 16:28:33 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 53)
> Jan 17 16:28:33 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 24)
> Jan 17 16:28:37 rpi3 kernel: [ 2918.072789] alloc_contig_range: [2a844, 2a845) PFNs busy
> Jan 17 16:28:37 rpi3 kernel: [ 2918.075609] alloc_contig_range: [2a844, 2a845) PFNs busy
> Jan 17 16:28:37 rpi3 kernel: [ 2918.078281] alloc_contig_range: [2a844, 2a845) PFNs busy
> Jan 17 16:28:37 rpi3 kernel: [ 2918.124162] alloc_contig_range: [2a844, 2a845) PFNs busy
> Jan 17 16:28:37 rpi3 kernel: alloc_contig_range: [2a844, 2a845) PFNs busy
> Jan 17 16:28:37 rpi3 kernel: alloc_contig_range: [2a844, 2a845) PFNs busy
> Jan 17 16:28:37 rpi3 kernel: alloc_contig_range: [2a844, 2a845) PFNs busy
> Jan 17 16:28:37 rpi3 kernel: alloc_contig_range: [2a844, 2a845) PFNs busy
> Jan 17 16:28:45 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 55)
> Jan 17 16:29:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 56)
> Jan 17 16:29:05 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 25)
> Jan 17 16:30:15 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 57)
> Jan 17 16:30:31 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 58)
> Jan 17 16:30:31 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 26)
> Jan 17 16:30:54 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 59)
> Jan 17 16:31:21 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 61)
> Jan 17 16:31:25 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 27)
> Jan 17 16:32:31 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 63)
> Jan 17 16:32:31 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 28)
> Jan 17 16:35:44 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 64)
> Jan 17 16:37:00 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 65)
> Jan 17 16:37:00 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 29)
> Jan 17 16:37:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 67)
> Jan 17 16:37:13 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 30)
> Jan 17 16:37:49 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 68)
> Jan 17 16:38:09 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 69)
> Jan 17 16:38:39 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 70)
> Jan 17 16:39:09 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 71)
> Jan 17 16:39:09 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 31)
> Jan 17 16:39:44 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 72)
> Jan 17 16:39:44 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 32)
> Jan 17 16:40:06 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 73)
> Jan 17 16:40:06 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 33)
> Jan 17 16:40:48 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 77)
> Jan 17 16:40:48 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 35)
> Jan 17 16:41:28 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 78)
> Jan 17 16:41:58 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 79)
> Jan 17 16:41:58 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 36)
> Jan 17 16:42:17 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 80)
> Jan 17 16:42:29 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 81)
> Jan 17 16:42:29 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 37)
> Jan 17 16:42:47 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 83)
> Jan 17 16:42:47 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 38)
> Jan 17 16:43:26 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 84)
> Jan 17 16:44:46 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 85)
> Jan 17 16:44:46 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 39)
> Jan 17 16:45:10 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 86)
> Jan 17 16:45:10 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 40)
> Jan 17 16:46:45 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 88)
> Jan 17 16:47:32 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 89)
> Jan 17 16:47:32 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 41)
> Jan 17 16:48:17 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 90)
> Jan 17 16:48:17 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 42)
> Jan 17 16:48:53 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 92)
> Jan 17 16:49:23 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 93)
> Jan 17 16:50:03 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: H264 @ #1911 Continuity counter error (total 94)
> Jan 17 16:50:03 rpi3 tvheadend[238]: TS: DVB-S Network/12130H/NBR: MPEG2AUDIO @ #1912 Continuity counter error (total 43)
>
> From this test, it is clear that tvheadend is losing data from the TV
> capture USB stick. On the tests I ran before, either reverting changeset
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4cd13c21b207e80ddb1144c576500098f2d5f882
> or applying this fixup:
> https://git.linuxtv.org/mchehab/experimental.git/commit/?h=softirq_fixup&id=7996c39af87d329f64e6b1b2af120d6ce11ede29
>
> it got better results.
>
> I intend to do further tests on it. Do you have some procedure to better
> test it?
I see, so you may want to test (possibly much) higher values of MAX_SOFTIRQ_RESTART,
such as 50 or 100.
We are now setting call limits per jiffy frame. Perhaps I should still keep limits per
do_softirq() calls as well and couple both.
Thanks for testing this!
>
> Thanks,
> Mauro
>
>
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