Re: [SLE] NFS Performance issue

From: Dylan (dylan_at_dylan.me.uk)
Date: 12/17/04

  • Next message: Jason Tesser: "[SLE] nvidia twin view help" 
    To: suse-linux-e@suse.com
Date: Fri, 17 Dec 2004 20:18:21 +0000

    On Friday 17 Dec 2004 19:52 pm, Brad Bourn wrote:
    > On Friday 17 December 2004 11:38 am, James Oakley wrote:
    > > The 'sync' option *really* slows NFS down. It's a must if you're
    > > mounting homedirs and users are keeping files open in applications.
    >
    > I have diskless workstations that boot ltsp and access an application
    > that plays movies. With SuSE 8.2 & 9.0, the loading of the
    > application was relativelely quick. With 9.1 and 9.2 it takes a VERY
    > noticeable amount of time to load the application. Once everything
    > is loaded, they both seem to run the same speed. Could this be why
    > for me also?
    >
    > Could you elaborate a little more on the pro's and con's of sync vs.
    > async.

    This is really only important for opening files for writing. Basically,
    with sync, the server is forced to complete a file operation before
    returning a result to the client. With async, the server simply
    acknowledges the operation and caches it to commit in its own time. For
    reading a file this is not a particular issue, since the file is not
    changing. When it comes to writing OTOH, sync means that an update is
    written to the disk immediately, whereas async means it's held back in
    cache until the server can be bothered to deal with it.

    >
    > I am limited to about 13 - 14 workstations playing the same video
    > file at the same time on the servers nfs share before bandwidth
    > becomes an issue.

    Have you tried adjusting the rsize and wsize options on the nfs mount? I
    get best performance with each set at 16384.

    Dylan

    > I tried streaming the video instead using
    > videolanclient, but the workstations didn't seem to be powerfull
    > enough to decode both the steam and the video at the same time.
    >
    >
    > B-) 

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