Re: Time sliced CFQ io scheduler

[Andrew Morton]

Jens Axboe <axboe@xxxxxxx> 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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