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    SubjectRe: Terrible VM in 2.4.11+?
    On Wed, Jul 10 2002, Thomas Tonino wrote:
    > J.A. Magallon wrote:
    > >Seriously, if you have that kind of problems, take the -aa kernel and use
    > >it.
    > >I use it regularly and it behaves as one would expect, and fast.
    > >And please, report your results...
    > I run a 2 cpu server with 16 disks and around 5 megabytes of writes a
    > second. With plain 2.4.18 (using the qlogic driver) and 2GB
    > ram, this seemed okay. Upgrading to 4GB ram slowed the system down, and
    > normal shell commands became quite unresponsive with 4GB.
    > So we built a second server, with 2.4.19-pre9-aa2 using the qlogic
    > driver in the kernel. That driver needs patching, as it will otherwise
    > get stuck in a 'no handle slots' condition. Used a patch that I posted
    > to linux-scsi a while ago.

    That's probably not just a mm issue, if you use stock 2.4.18 with 4GB
    ram you will spend oodles of time bounce buffering i/o. 2.4.19-pre9-aa2
    includes the block-highmem stuff, which enables direct-to-highmem i/o,
    if you enabled the CONFIG_HIGHIO option.

    In short, not an apples-to-apples comparison :-)

    Jens Axboe

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