[Lustre-discuss] Performance drop (1.6.5 vs, OFED 1.2)?

Johann Lombardi johann at sun.com
Sat Oct 18 01:23:38 PDT 2008

On Wed, Jul 16, 2008 at 06:26:05PM +0200, Andrei Maslennikov wrote:
> I however worry much more about the case when checksumming is
> disabled. Do you think that the 20% performance drop may also be explained by
> the combination of ([6] server / [7] client)??

LRU resize is disabled by default in whereas it is enabled in
We have found a problem with this new feature recently (i.e. the LRU shrinking
code is running much too often causing a performance drop):

You can disable LRU resize in by running the following command on the
lustre clients:
lctl set_param ldlm.namespaces.*osc*.lru_size=$((100 * nbprocs))
(replace nbprocs by the number of CPUs on the node)


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