Re: [NFS] NFS performance debugging

[Trond Myklebust <trond.myklebust@fys.uio.no>]

On Wed, 2008-06-25 at 09:02 +0200, Adrian von Bidder wrote:
> 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?

You can catch the info on the client. See the 'nfs-iostat' tool in the
latest nfs-utils git tree:

  http://git.linux-nfs.org/?p=steved/nfs-utils.git;a=summary

Trond


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