From: William Lee Irwin III <wli@holomorphy.com>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: Andi Kleen <ak@muc.de>, linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Dcache hash distrubition patches
Date: Mon, 10 Mar 2003 23:47:12 -0800 [thread overview]
Message-ID: <20030311074712.GG20188@holomorphy.com> (raw)
In-Reply-To: <26350000.1047368465@[10.10.2.4]>
On Mon, Mar 10, 2003 at 11:41:07PM -0800, Martin J. Bligh wrote:
> It's not perfect, but not bad either. Some mathematician can go calculate
> just how imperfect it is over random distribution, but it looks OK to me ;-)
Okay, the standards are a bit more stringent for hash functions. You
basically want the total number of collisions to be minimized.
That said, standard statistical things are useful for first-pass
discrimination.
This looks basically okay, but if it's really just even with respect
to cache pressure the need for a different data structure in the
eventual future is clear. I'd need a baseline (pre-hlist) dcache
snapshot to compare against to get a better idea.
-- wli
next prev parent reply other threads:[~2003-03-11 7:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-10 17:45 Dcache hash distrubition patches Martin J. Bligh
2003-03-10 17:52 ` Andi Kleen
2003-03-11 7:41 ` Martin J. Bligh
2003-03-11 7:47 ` William Lee Irwin III [this message]
2003-03-11 15:23 ` Andi Kleen
2003-03-11 15:31 ` Martin J. Bligh
2003-03-11 16:27 ` Andi Kleen
2003-03-11 17:29 ` Anton Blanchard
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