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

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Message-ID: <20081209123703.043067eb@dhcp-100-2-144.bos.redhat.com>
Date:	Tue, 9 Dec 2008 12:37:03 -0500
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Jan Rekorajski <baggins@...h.mimuw.edu.pl>
Cc:	linux-kernel@...r.kernel.org,
	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>,
	Manfred Spraul <manfred@...orfullife.com>
Subject: Re: Nasty regression from .27.7 to .27.8: idle samba goes crazy

On Mon, 8 Dec 2008 23:22:46 +0100
Jan Rekorajski <baggins@...h.mimuw.edu.pl> wrote:

> 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).
> 

Try reverting the idr patch that went into 2.6.27.8. It broke DRM in the
Fedora kernel at least.

http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git;a=blob_plain;f=releases/2.6.27.8/lib-idr.c-fix-rcu-related-race-with-idr_find.patch;h=b1145766fb9460a0c0285350b49216355c5b4ad8
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