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    SubjectRe: 2.6.12 Performance problems
    Danial Thom wrote:
    > --- Ben Greear <> wrote:
    >>Danial Thom wrote:
    >>>I think the concensus is that 2.6 has made
    >>>offs that lower raw throughput, which is what
    >>>networking device needs. So as a router or
    >>>network appliance, 2.6 seems less suitable. A
    >>>bridging test on a 2.0Ghz operton system:
    >>>FreeBSD 4.9: Drops no packets at 900K pps
    >>>Linux 2.4.24: Starts dropping packets at 350K
    >>>Linux 2.6.12: Starts dropping packets at 100K
    >>I ran some quick tests using kernel 2.6.11, 1ms
    >>tick (HZ=1000), SMP kernel.
    >>Hardware is P-IV 3.0Ghz + HT on a new
    >>SuperMicro motherboard with 64/133Mhz
    >>PCI-X bus. NIC is dual Intel pro/1000. Kernel
    >>is close to stock 2.6.11.

    > What GigE adapters did you use? Clearly every
    > driver is going to be different. My experience is
    > that a 3.4Ghz P4 is about the performance of a
    > 2.0Ghz Opteron. I have to try your tuning script
    > tomorrow.

    Intel pro/1000, as I mentioned. I haven't tried any other
    NIC that comes close in performance to the e1000.

    > If your test is still set up, try compiling
    > something large while doing the test. The drops
    > go through the roof in my tests.

    Installing RH9 on the box now to try some tests...

    Disk access always robs networking, in my experience, so
    I am not supprised you see bad ntwk performance while


    Ben Greear <>
    Candela Technologies Inc

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      Last update: 2005-08-25 08:18    [W:0.023 / U:1.744 seconds]
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