Re: NFS slow/lockups

From: Alan Chandler (alan_at_chandlerfamily.org.uk)
Date: 10/15/04

  • Next message: Nick Hastings: "Re: x server configuration problems" 
    To: debian-user@lists.debian.org
Date: Fri, 15 Oct 2004 11:00:18 +0100

    Miquel van Smoorenburg writes:

    > In article <20041013223347.GA2883@scatterbolt.r00tserverz.net>,
    > Tim Kelley <tpk@r00tserverz.net> wrote:
    >>On Wed, Oct 13, 2004 at 09:05:21PM +0100, Alan Chandler wrote:
    >>> Just to show its not networking problems, I have resorted to copying
    >>the files
    >>> via scp - even encrypted I am getting about 0.5Mb/sec
    >>
    >>That's horrible! Is this a 10Mb network or dialup or what? Surely you
    >>mean .5 MBytes/sec (which also isn't too hot for a 10Mbit ethernet).
    >>
    >>> Any idea whats wrong and how to improve performance?
    >>
    >>Some basic things:
    >>
    >>1. If you have a switch, make sure it your interfaces are at full
    >>duplex
    >
    > But do not force the switch interface to full duplex. At least on
    > Cisco's, if you configure the switch at full duplex (as opposed
    > to "auto"), then it will not negotiate full/half duplex anymore.
    > And since almost all Linux ethernet device drivers default to
    > half-duplex, you get a guaranteed duplex/half-duplex mismatch.
    >
    > And .5 Mbytes/sec on a 100 mbit network is what you end up with.
     

    Both you guys have missed my main message - the speed I was talking about
    was using SCP - so perhaps its also processors trying to do encrypt the
    message.

    The throughput with nfs was more like 2MB every 3 or 4 minutes - something
    somewhere in that setup is causing me extreme grief and I don't know what.
    I could really do with some pointers as to why that is not working. As far
    as I am concerned 05.Mbytes (thats what it was) is plenty fast enough (and
    its a 100mbit ethernet anyway). 

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  • Next message: Nick Hastings: "Re: x server configuration problems"

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