Messages in this thread | | | Date | Wed, 10 Jul 2002 10:49:04 +0200 | From | Jens Axboe <> | Subject | Re: Terrible VM in 2.4.11+? |
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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
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