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    SubjectRe: Still not sexy! (Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN)

    On Wed, 31 Jan 2001, Malcolm Beattie wrote:

    > Without the raised tcp_wmem setting I was getting 81 MByte/s. With
    > tcp_wmem set as above I got 86 MByte/s. Nice increase. Any other
    > setting I can tweak apart from {r,w}mem_max and tcp_{w,r}mem? The CPU
    > on the client (350 MHz PII) is the bottleneck: gensink4 maxes out at
    > 69 Mbyte/s pulling TCP from the server and 94 Mbyte/s pushing. (The
    > other system, 733 MHz PIII pushes >100MByte/s UDP with ttcp but the
    > client drops most of it).

    you can speed up the client significantly by using the MSG_TRUNC option
    ('truncate message'). It will zap incoming data without copying it into
    user-space. (you can use this for the 'bulk transfer' part - the initial
    protocol handling code needs to see the actual data.) This way you should
    be able to saturate the server even more.


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