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SubjectRe: 2.6.25-rc6-git2: warn_on_slowpath for tcp_simple_retransmit
On Wed, Apr 2, 2008 at 10:10 AM, Ilpo Järvinen
<ilpo.jarvinen@helsinki.fi> wrote:
> On Wed, 2 Apr 2008, Alessandro Suardi wrote:
>
> > Found this in my FC6-based bittorrent box (K7-800 running
> > a 2.6.25-rc6-git2 kernel) this evening.
> >
> > The kernel was upgraded two weeks ago to fix the bug
> > in which an USB VIA driver hammered the PCI bus
> > causing ATA disk performance to drop, and has been
> > running since then (it still is).
> >
> > So it's actually 2.6.25-rc6-git2 plus patch as in here
> > http://www.gossamer-threads.com/lists/linux/kernel/895506#895506
> >
> > If there's anything useful I can do, just ask. Thanks !
>
> Can you reproduce?

Nope. That only happened once in this uptime:

[root@donkey ~]# uptime
21:57:21 up 14 days, 22:04, 5 users, load average: 0.64, 0.47, 0.44

The machine runs unattended as a bittorrent client, 24x7,
with a very low traffic (uploading at a steady ~36KB/s,
and downloads happen in peaks).

I VNC into it in the evening and manage the torrents;
that is all.

Now, there's an interesting tidbit:

[root@donkey ~]# ip -s link show eth0
3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000
link/ether 00:c0:49:a7:33:fe brd ff:ff:ff:ff:ff:ff
RX: bytes packets errors dropped overrun mcast
959044156 60549131 0 0 0 0
TX: bytes packets errors dropped carrier collsns
744533957 66149681 0 0 0 0

[root@donkey ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:C0:49:A7:33:FE
inet addr:192.168.1.7 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::2c0:49ff:fea7:33fe/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:60551468 errors:0 dropped:0 overruns:0 frame:0
TX packets:66152721 errors:0 dropped:0 overruns:1 carrier:0
collisions:0 txqueuelen:1000
RX bytes:959199592 (914.7 MiB) TX bytes:748395356 (713.7 MiB)
Interrupt:12 Base address:0xce00

Somehow the "overruns" counter is seen differently by 'ip'
and 'ifconfig' - one says 0, the other says 1 - perhaps the
packet that WARN'd me on tcp_simple_retransmit ?

If there's anything else - reproducing seems really really
unlikely - 1 packet in 66 million...

Thanks,

--alessandro

"Hold back the years, hold back the hours
I want to live to see the sun break through these days"

(Patrick Wolf, 'This Weather')
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