From: "Ray Lee" <ray-lk@madrabbit.org>
To: "Chris Friesen" <cfriesen@nortel.com>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: questions on NAPI processing latency and dropped network packets
Date: Fri, 11 Jan 2008 21:37:18 -0800 [thread overview]
Message-ID: <2c0942db0801112137k3f3f885ek212d5cbaecb7fea0@mail.gmail.com> (raw)
In-Reply-To: <478654C3.60806@nortel.com>
On Jan 10, 2008 9:24 AM, Chris Friesen <cfriesen@nortel.com> wrote:
> After a recent userspace app change, we've started seeing packets being
> dropped by the ethernet hardware (e1000, NAPI is enabled). The
> error/dropped/fifo counts are going up in ethtool:
(These are perhaps too obvious, but I didn't see the questions or
answers in the thread.)
Can you reproduce it with a simple userspace cpu hog? (Two, really,
one per cpu.)
Can you reproduce it with the newer e1000?
Can you reproduce it with git head?
If the answer to the first one is yes, the last no, then bisect until
you get a kernel that doesn't show the problem. Backport the fix,
unless the fix happens to be CFS. However, I suspect that your
userpace app is just starving the system from time to time.
next prev parent reply other threads:[~2008-01-12 5:37 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-10 17:24 Chris Friesen
2008-01-10 17:37 ` Kok, Auke
2008-01-10 18:12 ` Chris Friesen
2008-01-10 18:26 ` Kok, Auke
2008-01-10 18:25 ` James Chapman
2008-01-10 21:29 ` Chris Friesen
2008-01-10 18:41 ` Rick Jones
2008-01-10 19:01 ` Kok, Auke
2008-01-11 1:20 ` David Miller
2008-01-11 14:59 ` Chris Friesen
2008-01-11 22:29 ` Herbert Xu
2008-01-12 1:53 ` David Miller
2008-01-14 15:58 ` Chris Friesen
2008-01-15 7:19 ` Jarek Poplawski
2008-01-15 14:47 ` Chris Friesen
2008-01-15 15:17 ` Radoslaw Szkodzinski
2008-01-15 17:14 ` Chris Friesen
2008-01-15 17:23 ` Eric Dumazet
2008-01-15 20:29 ` Jarek Poplawski
2008-01-16 0:17 ` Herbert Xu
2008-01-16 6:58 ` Jarek Poplawski
2008-01-16 20:04 ` Willy Tarreau
2008-01-16 22:42 ` Jarek Poplawski
2008-01-12 5:37 ` Ray Lee [this message]
2008-01-14 15:49 ` Chris Friesen
2008-01-14 16:56 ` Eric Dumazet
2008-01-14 19:25 ` Chris Friesen
2008-01-14 19:33 ` Eric Dumazet
2008-01-14 20:02 ` Chris Friesen
2008-01-15 15:09 ` Vlad Yasevich
2008-01-21 19:53 ` Chris Friesen
2008-01-21 21:11 ` Ben Greear
2008-01-21 23:15 ` Chris Friesen
2008-01-21 21:31 ` Eric Dumazet
2008-01-21 23:25 ` Chris Friesen
2008-01-22 5:46 ` Eric Dumazet
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