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    SubjectRe: [NFS] Re: [PATCH] zerocopy NFS for 2.5.36
    Date
    > >      > Congestion avoidance mechanism of NFS clients might cause this
    > > > situation. I think the congestion window size is not enough
    > > > for high end machines. You can make the window be larger as a
    > > > test.
    > >
    > > The congestion avoidance window is supposed to adapt to the bandwidth
    > > that is available. Turn congestion avoidance off if you like, but my
    > > experience is that doing so tends to seriously degrade performance as
    > > the number of timeouts + resends skyrockets.
    >
    > Yes, you must be right.
    >
    > But I guess Andrew may use a great machine so that the transfer rate
    > has exeeded the maximum size of the congestion avoidance window.
    > Can we determin preferable maximum window size dynamically?

    Is this a concern on the client only? I can run a test with just one client
    and see if I can saturate the 100Mbit adapter. If I can, would we need to
    make any adjustments then? FYI, at 115 MB/sec total throughput, that's only
    2.875 MB/sec for each of the 40 clients. For the TCP result of 181 MB/sec,
    that's 4.525 MB/sec, IMO, both of which are comfortable throughputs for a
    100Mbit client.

    Andrew Theurer

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