On Tuesday 24 June 2008 22.29:31 J. Bruce Fields wrote: > On Tue, Jun 24, 2008 at 12:17:24PM +0200, Adrian von Bidder wrote: > > Starting KDE, opening documents, sometimes also closing oo.org and > > saving documents takes several seconds longer than on local disk. > > "close" on nfs is an operation that requires a round-trip to the server > and waiting for the disk to commit any writes made before the close, so > if you've got to do a lot of those it can take time. Fooling with the > journaling on the exported filesystem may help. Are there tools to measure latencies on NFS? Given a network dump, desired output would be histograms of latencies by file operation? (Or maybe I can catch the information on the client, VFS side instead of NFS? At this time, I really need to collect more data on where the problem is since all I'm doing right now is fooling around based on assumptions... :-( OTOH I'd suspect KDE/oo.org startup to be mostly reads of those config files, so the problem shouldn't be close latencies. Assumptions again. > > TODO today: play around with NFSv4 on the shaky assumption that nfsv3 > > is actually working but net latency is killing my performance. > > Delegations *might* help if the problem is really open latency. First tries showed * There are no acl on my files now * user id mapping seems funny: some users map to nobody, others map correctly. Huh? * Performance seems to be ok (timing desktop applications is always difficult, and so far I'm working against on the production server with varying load anyway...) Haven't investigated these yet... cheers -- vbi -- Today is Sweetmorn, the 30th day of Confusion in the YOLD 3174
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