Re: [RFC][PATCH 0/3] Skip I/O merges when disabled

From: Carl Henrik Lunde
Date: Thu Apr 24 2008 - 18:04:45 EST


On Thu, Apr 24, 2008 at 4:13 PM, Alan D. Brunelle <Alan.Brunelle@xxxxxx> wrote:
[...]
> o The kernel already exports stats on merges, so the daemon could watch
> those stats in comparison to the number of I/Os submitted. If it
> determined that merge attempts were not being very successful, it could
> turn off merges for a period of time. Later it could turn them back on,
> watch for a while, and repeat.
>
> Does this sound better/worthwhile?

It may be more interesting to make a program which makes some helpful
suggestions
after looking at a blktrace file. The program could for example
suggest changing
the I/O scheduler, increasing a parameter such as slice_sync, or disable merges.

--
Carl Henrik
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