netdev - Re: Nasty regression from .27.7 to .27.8: idle samba goes crazy

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Date:	Mon, 8 Dec 2008 23:22:46 +0100
From:	Jan Rekorajski <baggins@...h.mimuw.edu.pl>
To:	linux-kernel@...r.kernel.org
Cc:	Holger Hoffstaette <holger@...ards.de>, netdev@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>, Greg KH <greg@...ah.com>,
	stable@...nel.org, Stefan Richter <stefanr@...6.in-berlin.de>
Subject: Re: Nasty regression from .27.7 to .27.8: idle samba goes crazy

On Mon, 08 Dec 2008, Stefan Richter wrote:

> >>> On Monday, 8 of December 2008, Holger Hoffstaette wrote:
> >>>> The system is a generic old single-core P4 box with a single SATA drive,
> >>>> Gentoo userland and Samba is 3.0.33 (in async mode). The kernel has no
> >>>> patches or binary drivers.
> 
> Holger, it may be unrelated to the issue, but to be sure:  Which network
> card driver do you use?

I think you can safely rule out NIC, I'm also seeing this behaviour on a
brand new server with imap hanging in some busy-loop.
Network card in my case:
Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet (rev 12)

What I observer was one CPU doing 100% system work, and the number of
timer interrupts went from 1k per second to 4k (for the whole system).

I didn't report it because I thought it's one of patches I have to blame.
Oh, and, unfortunately, I can't bisect, I'm seeing this only on one machine
that has to be running.

Jan
-- 
Jan Rekorajski            |  ALL SUSPECTS ARE GUILTY. PERIOD!
baggins<at>mimuw.edu.pl   |  OTHERWISE THEY WOULDN'T BE SUSPECTS, WOULD THEY?
BOFH, MANIAC              |                   -- TROOPS by Kevin Rubio
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