[Linux-cluster] |Optimizing DLM Speed

[David Teigland]

On Wed, May 18, 2011 at 06:52:24PM +0100, Steven Whitehouse wrote:
> > >> Is there any progress on tuning the size of the tables (RHEL5) to allow 
> > >> larger values and see if they help things as far as caching goes?
> > >>
> > > There is a bz open, 
> > 
> > I thought so, but I can't find it.
> > 
> Its #678102, which you are on the cc list of. It probably needs a RHEL5
> bug as well. Bryn posted a patch to it to make the change, but I'm not
> sure of the current status. I'm copying in Dave Teigland so that he can
> comment on the current status.
> 
> > > and you should ask for that to be linked to one of
> > > your support cases, if it hasn't already been. I thought we'd concluded
> > > though that this didn't actually affect your particular workload.
> > 
> > Increasing them to 4096 hasn't but larger numbers might.

I'd suggest applying Bryn's vmalloc patch, and trying a higher value to
see if it has any effect.  If it does, we can certainly get that patch and
larger default values queued up for various releases.

Thanks,
Dave