lkml.org 
[lkml]   [2002]   [Jul]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    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 feral.com 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

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:27    [W:3.155 / U:0.392 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site