[Linux-cluster] |Optimizing DLM Speed

Alan Brown ajb2 at mssl.ucl.ac.uk
Wed May 18 17:34:45 UTC 2011

Steven Whitehouse wrote:
> Hi,
> On Wed, 2011-05-18 at 16:14 +0100, Alan Brown wrote:
>> Bob, Steve, Dave,
>> 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.

> 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.

>> It would be advantageous to tweak the dentry limits too - the kernel 
>> limits this to 10% and attempts to increase are throttled back.
> Yes, I've not forgotten this. I've been working on some similar issues
> recently and I'll explore this more fully once I'm done with the
> writeback side of things.

Do you have a BZ for this one?

>> This doesn't scale for larger memory sizes on fileservers and  I think 
>> it's a hangover from 4Gb ram days.
>> AB
> Yes, it might well be, so we should certainly look into it. Again
> though, please ensure that you raise this through support so that (a) it
> doesn't get missed by accident and (b) that we are all in the loop. If
> there are not tickets open for these, then we need to resolve that in
> order to push this forward,


> Steve.
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