[Lustre-discuss] Performance drop (1.6.5 vs 188.8.131.52, OFED 1.2)?
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 (184.108.40.206 server / 220.127.116.11 client)??
LRU resize is disabled by default in 18.104.22.168 whereas it is enabled in 22.214.171.124.
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 126.96.36.199 by running the following command on the
lctl set_param ldlm.namespaces.*osc*.lru_size=$((100 * nbprocs))
(replace nbprocs by the number of CPUs on the node)
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