[CentOS] MySQL issues with kernel-2.6.18-53.1.6.el5.x86_64.rpm

[Bent Terp]

On 1/24/08, Karanbir Singh <mail-lists at karan.org> wrote:
> Bent Terp wrote:
> > Hi all!
> >
> > Just a word of warning: after updating a few of our x86_64 based web
> > frontend boxes to the new kernel, we began to get weird MySQL
> > timeouts. The problem went away again when we downgraded to the
> > previous kernel-2.6.18-53.1.6.el5.x86_64.rpm
> >
> A bit more info / context would be nice !

We upgraded our web front servers to kernel 2.6.18-53.1.6, and
suddenly sites wouldn't load. It seemed to be that the connections
from php to the backend sql servers timed out, so we immediately
downgraded back to 2.6.18-53.1.4

Now that we've had more time to look at the problem, it is not related
to mysql, sorry about that. Rather, it looks as if the set of nfs
patches do not agree with our EMC Cellera NAS server. Backing out that
bunch and rebuilding makes the problem go away.

The patches that gives us problems, results in a kernel which makes
something like 2000 times more "NFS V3 LOOKUP Call" and "NFS V3 LOOKUP
Reply" than without.

Has something changed with regard to the mount options? We use
(rw,noatime,rsize=8192,wsize=8192,hard,udp,context="system_u:object_r:httpd_sys_content_t:s0)
which has worked fine until now.

regards,
  Bent