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SubjectRe: Very bad interactivity with 2.6.0 and SCSI disks (aic7xxx)
> But as soon as I do a
> while true; do dd if=/dev/zero of=test bs=1024 count=1048576 ; rm test
> ; done
> on my SCSI disk, the system becomes completely unusuable after a few
> seconds. Everything is running at the speed of molasses, even screen
> redrawing, the music stops playing for some seconds, my mouse hangs
> and so on.

It sounds like the system is not limiting the rate at which an I/O
hog can dirty pages, so this one process ends up consuming all of
your I/O bandwidth.


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