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    SubjectRe: [RESEND] tuning linux for high network performance?
    Date
    On 23 October 2002 11:36, Roy Sigurd Karlsbakk wrote:
    > > > 905182 total 0.4741
    > > > 121426 csum_partial_copy_generic 474.3203
    > >
    > > Well, maybe take a look at this func and try to optimize it?
    >
    > I don't know assembly that good - sorry.

    Well, I like it. Maybe I can look into it. Feel free
    to bug me :-)

    > > > 93633 default_idle 1800.6346
    > > > 74665 do_wp_page 111.1086
    > >
    > > What's this?
    >
    > do_wp_page is Defined as a function in: mm/memory.c
    >
    > comments from the file:
    > [snip]

    Please delete memory.o, rerun make bzImage, capture gcc
    command used for compiling memory.c, modify it:

    gcc ... -o memory.o -> gcc ... -S -o memory.s ...

    and examine assembler code. Maybe something will stick out
    (or use objdump to disassemble memory.o, I recall nice
    option to produce assembler output with C code intermixed
    as comments!) (send disasmed listing to me offlist).

    > > > 65857 ide_intr 184.9916
    > >
    > > You have 1 ide_intr per 2 csum_partial_copy_generic... hmmm...
    > > how large is your readahead? I assume you'd like to fetch
    > > more sectors from ide per interrupt. (I hope you do DMA ;)
    >
    > doing DMA - RAID-0 with 1MB chunk size on 4 disks.

    You should aim at maxing out IDE performance.
    Please find out how many sectors you read in one go.
    Maybe:

    # cat /proc/interrupts
    # dd bs=1m count=1 if=/dev/hda of=/dev/null
    # cat /proc/interrupts

    and calculate how many IDE interrupts happened. (1mb = 2048 sectors)
    --
    vda
    -
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