linux-kernel - Re: [Patch] Scale pidhash_shift/pidhash_size up based on num_possible

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Message-ID: <m14p64zetj.fsf@frodo.ebiederm.org>
Date:	Fri, 01 Aug 2008 12:59:52 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Robin Holt <holt@....com>
Cc:	linux-kernel@...r.kernel.org, Pavel Emelyanov <xemul@...nvz.org>,
	Oleg Nesterov <oleg@...sign.ru>,
	Sukadev Bhattiprolu <sukadev@...ibm.com>,
	Paul Menage <menage@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch] Scale pidhash_shift/pidhash_size up based on num_possible_cpus().

Robin Holt <holt@....com> writes:

> Oops, confusing details.  That was a different problem we had been
> tracking.

Which leads back to the original question.  What were you measuring
that showed improvement with a larger pid hash size?

Almost by definition a larger hash table will perform better.  However
my intuition is that we are talking about something that should be in
the noise for most workloads.

Eric
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