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Re: [Linux-cluster] optimising DLM speed?



On Thu, Feb 17, 2011 at 09:24:41PM +0000, Alan Brown wrote:
> David Teigland wrote:
> >
> >Don't change the buffer size, but I'd increase all the hash table sizes to
> >4096 and see if anything changes.
> >
> >echo "4096" > /sys/kernel/config/dlm/cluster/rsbtbl_size
> >echo "4096" > /sys/kernel/config/dlm/cluster/lkbtbl_size
> >echo "4096" > /sys/kernel/config/dlm/cluster/dirtbl_size
> 
> Increasing rsbtbl_size to 4096 or higher results in FSes refusing to
> mount and clvm refusing to start - both with "cannot allocate
> memory"
> 
> At 2048, it works, but gfs_controld and dlm_controld exited when I
> tried to mount all FSes on one node as a test.
> 
> At 1024 it seems stable.
> 
> The other settings seemed to have applied OK. So far, reports are
> positive (but it's quiet at the moment)
> 
> I've got a strace of clvmd trying to start with rsbtbl_size set to
> 4096. Should I post it here or would you prefer it mailed direct?

Thanks for testing, you can post here.


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