Re: 2.6.12 Performance problems

From: Ben Greear (greearb_at_candelatech.com)
Date: 08/25/05

  • Next message: Pete Popov: "Re: [PATCH 2/3] exterminate strtok - drivers/video/au1100fb.c" 
    Date:	Wed, 24 Aug 2005 23:15:38 -0700
To: danial_thom@yahoo.com

    Danial Thom wrote:
    >
    > --- Ben Greear <greearb@candelatech.com> wrote:
    >
    >
    >>Danial Thom wrote:
    >>
    >>
    >>>I think the concensus is that 2.6 has made
    >>
    >>trade
    >>
    >>>offs that lower raw throughput, which is what
    >>
    >>a
    >>
    >>>networking device needs. So as a router or
    >>>network appliance, 2.6 seems less suitable. A
    >>
    >>raw
    >>
    >>>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
    >>
    >>pps
    >>
    >>>Linux 2.6.12: Starts dropping packets at 100K
    >>
    >>pps
    >>
    >>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
    compiling.

    Ben 

    -- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com
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