Re: 2.6.9: unkillable processes during heavy IO

Nathan Scott
2004-11-17T05:57:43Z

On Tue, Nov 16, 2004 at 08:01:56PM -0800, Andrew Morton wrote:
> Brad Fitzpatrick <brad@danga.com> wrote:
> >
> > Here is the information requested regarding the regular lockup we're
> > seeing (details in original post at bottom)
>
> yup, that looks like a locking tangle in the XFS direct-io code.
>
> Nathan, this is 2.6.9.

Hmmm, yeah, looks like it - bother.

> > On Sun, 14 Nov 2004, Brad Fitzpatrick wrote:
> >
> > > We have two database servers which freeze up during heavy IO load. The

Brad, could you send me details on how you've setup mysqld
and how to generate a load similar to yours, so that I can
reproduce the hang locally?

> > > The hardware/software stack is:
> > >
> > > - Dual Opteron 246, SMP kernel, w/ NUMA
> > > - 9 GB of memory (4GB in one zone, 5GB in the other)
> > > - MySQL, running mostly InnoDB, but some MyISAM

( I don't even know what those two things are, so you can
probably guess at the level of assistance I'll need here. :)

thanks!

--
Nathan