DragonFly kernel List (threaded) for 2007-07
Re: poor performance on big machine
On Mon, 30 Jul 2007 09:57:11 -0700 (PDT)
Matthew Dillon <email@example.com> wrote:
> I don't think an I/O scheduler will help. You are maxing out the hard
> drive with your workload. MB/sec is irrelevant... the workload is
> causing the disk to seek a lot.
If it is thrashing between a small number of areas then it may be
possible to improve things with a scheduler that buffers and attempts to
cluster the requests by track (OK address proximity). In extreme cases
going from one operation per seek to two operations per seek would be a
Of course this is likely to interfere with any "has been committed
to disc" semantics needed.
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