linux-kernel - Re: read() syscall slowing down due to other threads?

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Message-ID: <CANkdjvZJU5Z3eLk2_Orz+J0OJ6z0=ui6uUJUPwqh-dnjNPk+ZQ@mail.gmail.com>
Date:	Tue, 1 May 2012 05:47:04 -0700
From:	George Porter <gmporter@...ucsd.edu>
To:	Nick Piggin <npiggin@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: read() syscall slowing down due to other threads?

On Mon, Apr 30, 2012 at 11:40 PM, Nick Piggin <npiggin@...il.com> wrote:
> It could be memory or coherency traffic that's causing a slowdown across
> the system?
>
> Could a dynamic core frequency / thermal throttling explain any of the
> slowdown?

Thanks for these suggestions.  I checked the BIOS, and indeed it was
set to "Hybrid power/performance."  I just reset the server to "Static
high performance" which I believe turns off processor frequency power
optimizations.  I'll re-run our workload and see if that has an
effect.

Thanks, George
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