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    SubjectRe: [PATCH] tcp: splice as many packets as possible at once
    From: Willy Tarreau <>
    Date: Mon, 19 Jan 2009 07:14:20 +0100

    > On Sun, Jan 18, 2009 at 07:27:19PM -0800, David Miller wrote:
    > > From: Herbert Xu <>
    > > Date: Mon, 19 Jan 2009 14:08:44 +1100
    > >
    > > > One thing to note is that Myricom's driver probably uses page
    > > > frags which means that you're not actually triggering the copy.
    > So does this mean that the corruption problem should still there for
    > such a driver ? I'm asking before testing, because at these speeds,
    > validity tests are not that easy ;-)

    It ought not to, but it seems that is the case where you
    saw the original corruptions, so hmmm...

    Actually, I see, the myri10ge driver does put up to
    64 bytes of the initial packet into the linear area.
    If the IPV4 + TCP headers are less than this, you will
    hit the corruption case even with the myri10ge driver.

    So everything checks out.

    > > And this is also the only reason why jumbo MTU worked :-)
    > What should we expect from other drivers with jumbo frames ? Hangs,
    > corruption, errors, packet loss ?

    Upon recent review I think jumbo frames in such drivers should
    actually be fine.

     \ /
      Last update: 2009-01-19 07:23    [W:0.021 / U:40.888 seconds]
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