netdev - Re: sky2 hangs without any messages

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Message-ID: <20070711184659.279f8ea0@freepuppy.rosehill.hemminger.net>
Date:	Wed, 11 Jul 2007 18:46:59 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	"Daniel J Blueman" <daniel.blueman@...il.com>
Cc:	"Linux Netdev" <netdev@...r.kernel.org>
Subject: Re: sky2 hangs without any messages

On Wed, 11 Jul 2007 23:55:29 +0100
"Daniel J Blueman" <daniel.blueman@...il.com> wrote:

> > >
> > > Please try again with post 2.6.22 git version (1.16)?
> >
> > Reproduced with 2.6.22 w/ sky2 1.16 from git. We observe this
> > characteristic failure on the NFS server (always around 2-3GB of
> > transmit):
> >
> > $ ifconfig lan0
> > lan0      Link encap:Ethernet  HWaddr 00:03:2D:05:9C:27
> >           inet addr:192.168.0.250  Bcast:192.168.0.255  Mask:255.255.255.0
> >           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
> >           RX packets:24007220 errors:1 dropped:1 overruns:0 frame:1
> >           TX packets:13886495 errors:0 dropped:0 overruns:0 carrier:0
> >           collisions:0 txqueuelen:1000
> >           RX bytes:171026170 (163.1 MiB)  TX bytes:2262910580 (2.1 GiB)
> >           Interrupt:16
> >
> > I'll rebuild with debugfs and grab the debug you've exported.
> 
> In quiescent state [1] and in failure state [2]. This time, 2 framing
> failures [3]; took 3.6GB of transmit to hit the window.

Since the IRQ workaround has a timeout of 100ms. I observed cases where
the TCP connection dropped (because of lost packets), but the network device
then recovered.  Can you ping the other side after it hangs?  Or reconnect?

Ifconfig lumps a bunch of different errors together so it can confuse the issue.
Preference is for:
 	ip -s -s link show eth0
or 
	grep -v '^0' /sys/class/net/eth0/statistics/*

If the framing error does reproduce with the hang, perhaps the chip needs some
receive flush logic to recover. Receive errors normally put a message in syslog
output, did you look there?

> Daniel
> 
> --- [1]
> 
> # cat sky2/lan0
> IRQ src=0 mask=c000001d control=0
> Status ring (empty)
> Tx ring pending=191...191 report=191 done=191
> 
> Rx ring hw get=956 put=61 last=1023
> 
> --- [2]
> 
> # cat sky2/lan0
> IRQ src=0 mask=c000001d control=0
> Status ring (empty)
> Tx ring pending=251...251 report=251 done=251
> 
> Rx ring hw get=1020 put=160 last=1023
> 
> --- [3]
> 
> $ ifconfig lan0
> lan0      Link encap:Ethernet  HWaddr 00:03:2D:05:9C:27
>           inet addr:192.168.0.250  Bcast:192.168.0.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:13304841 errors:1 dropped:1 overruns:0 frame:2
>           TX packets:7493765 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:232720755 (221.9 MiB)  TX bytes:3964088142 (3.6 GiB)
>           Interrupt:16

You aren't hung because of lost IRQ. When than happens the debugfs output will have
a bunch of Tx packets stuck (not cleaned up), and Status messages, and receive packets.

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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