Bug#524199: linux-image-2.6.26-1-686: nfs unusable
On Wed, Apr 15, 2009 at 01:30:51PM +0100, Anton Ivanov wrote:
> Overtime any system with NFS usage grinds to a crawl. While root or /usr
> on NFS are most affected the same problem should affect other NFS usage.
> The symptoms are extremely high system load,
[snip]
> The reason seems to be: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git&a=commitdiff&h=23918b03060f6e572168fdde1798a905679d2e06
FWIW, we're also seeing this, on machines mounting several large NFS volumes
that serve virtual accounts (i.e., they all have the same UID/GID and no
shell access).
After ~two days of uptime, these moderately loaded machines (running Apache,
ProFTPD, and Courier IMAP) start spending >90% of CPU time in system state
and become so unresponsive that they must be rebooted. Running the 2.6.28
that was recently in sid (which contains the commit Anton mentions) fixed
this.
john
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