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DateTue, 7 Dec 2004 23:30:27 -0800
FromAndrew Morton <>
SubjectRe: Time sliced CFQ io scheduler
Jens Axboe <axboe@suse.de> wrote:
>
> I think we need to end up with something that sets the machine profile
> for the interesting disks. Some things you can check for at runtime
> (like the writes being extremely fast is a good indicator of write
> caching), but it is just not possible to cover it all. Plus, you end up
> with 30-40% of the code being convoluted stuff added to detect it.

We can detect these things from userspace. Parse the hdparm/scsiinfo
output, then poke numbers into /sys tunables.

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