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Message-ID: <AANLkTi=HhouZymj0R7JsDy-X1LDbfT_WL0x10EMhdOho@mail.gmail.com> Date: Tue, 9 Nov 2010 11:05:37 +1100 From: Andrew Hendry <andrew.hendry@...il.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: Jesper Dangaard Brouer <jdb@...x.dk>, netdev <netdev@...r.kernel.org> Subject: Re: Loopback performance from kernel 2.6.12 to 2.6.37 results on an i7 860 @ 2.80Ghz machine, no virtualization involved. 2.6.37-rc1+ # time dd if=/dev/zero bs=1M count=10000 | netcat 127.0.0.1 9999 10000+0 records in 10000+0 records out 10485760000 bytes (10 GB) copied, 50.2022 s, 209 MB/s real 0m50.210s user 0m1.094s sys 0m57.589s On Tue, Nov 9, 2010 at 2:06 AM, Eric Dumazet <eric.dumazet@...il.com> wrote: > Le lundi 08 novembre 2010 à 12:04 +0100, Eric Dumazet a écrit : >> Le lundi 08 novembre 2010 à 11:58 +0100, Jesper Dangaard Brouer a >> écrit : >> > On Fri, 2010-11-05 at 21:29 +0100, Eric Dumazet wrote: >> > > Le vendredi 05 novembre 2010 à 11:49 +0100, Jesper Dangaard Brouer a >> > > écrit : >> > > > Hi Eric, >> > > > >> > > > A colleague send me a link to someone who has done some quite extensive >> > > > performance measurements across different kernel versions. >> > > > >> > > > I noticed that the loopback performance has gotten quite bad: >> > > > >> > > > http://www.phoronix.com/scan.php?page=article&item=linux_2612_2637&num=6 >> > > > >> > > > I though you might be interested in the link. >> > > > >> > > > See you around :-) >> > > >> > > Hi ! >> > > >> > > Problem is : I have no idea what test they exactly use, >> > > do you have info about it ? >> > >> > Its called the Phoronix test-suite, their website is: >> > http://www.phoronix-test-suite.com/?k=home >> > >> > On my Ubuntu workstation their software comes as a software package: >> > sudo aptitude install phoronix-test-suite >> > >> > They seem to be related to the test/review site: >> > http://www.phoronix.com/ >> > >> > >> > >> > > This probably can be explained very fast. >> > >> > The loopback test seems to be the only real networking test they do. >> > It looks like they just copy a very big fil via loopback, and record the >> > time it took... quite simple. >> > >> > Their tests seems to be focused on CPU util/speed, graphics/games. >> > >> > >> > The thing that caught my attention, was that they seemed interested in >> > doing performance regression testing on all kernel versions... >> > >> > So, I though, it would be great if someone else would do automated >> > performance regression testing for us :-), Too bad they only have a >> > very simple network test. >> > >> > >> > >> > > CC netdev, if you dont mind. > > > Their network test is basically : > > netcat -l 9999 >/dev/null & > time dd if=/dev/zero bs=1M count=10000 | netcat 127.0.0.1 9999 > > They say it takes 38 seconds on their "super fast" processor > > On my dev machine, not super fast (E5540 @2.53GHz), I get 8 or 9 > seconds, even if only one CPU is online, all others offline. > > Go figure... maybe an artifact of the virtualization they use. > > I suspect some problem with the ticket spinlocks and a call to > hypervisor to say 'I am spinning on a spinlock, see if you need to do > something useful', or maybe ACPI problem (going to/from idle) > > > > > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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