Re: Linux I/O schedulers - CFQ & random seeks - Mailing list pgsql-performance

From Scott Marlowe
Subject Re: Linux I/O schedulers - CFQ & random seeks
Date
Msg-id AANLkTi=fRwgJx1-HwaiAPtRXGQTUNUhE4MpPbUYKLXWu@mail.gmail.com
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In response to Re: Linux I/O schedulers - CFQ & random seeks  (Dan Harris <fbsd@drivefaster.net>)
List pgsql-performance
On Fri, Mar 4, 2011 at 11:39 AM, Dan Harris <fbsd@drivefaster.net> wrote:
> Just another anecdote, I found that the deadline scheduler performed the
> best for me.  I don't have the benchmarks anymore but deadline vs cfq was
> dramatically faster for my tests.  I posted this to the list years ago and
> others announced similar experiences.  Noop was a close 2nd to deadline.

This reflects the results I get with a battery backed caching RAID
controller as well, both Areca and LSI.  Noop seemed to scale a little
bit better for me than deadline with larger loads, but they were
pretty much within a few % of each other either way.  CFQ was also
much slower for us.

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