From: William Lee Irwin III <wli@holomorphy.com>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: Andrew Morton <akpm@zip.com.au>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: kernbench: 2.5.59 vs 2.5.59-mm6 vs 2.5.59-mjb2
Date: Wed, 29 Jan 2003 14:28:55 -0800 [thread overview]
Message-ID: <20030129222855.GO780@holomorphy.com> (raw)
In-Reply-To: <62800000.1043878411@flay>
On Wed, Jan 29, 2003 at 02:13:31PM -0800, Martin J. Bligh wrote:
> not sure what's causing the pfn_to_nid and pgd_alloc improvements?)
pgd's and pmd's are in the slab, so the zeroing hit is only taken once
per pgd and pmd (best case). It's my patch that does this.
pfn_to_nid() is surely a random cache and/or ITLB gain from link
ordering, alignment in the final link, or some such nonsense.
pfn_to_nid() is a single shift, quite excessive for a function call.
It'd be best to inline this and get the random ITLB etc. misses out
of the profiles esp. as they aren't reproducible.
-- wli
prev parent reply other threads:[~2003-01-29 22:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-29 22:13 kernbench: 2.5.59 vs 2.5.59-mm6 vs 2.5.59-mjb2 Martin J. Bligh
2003-01-29 22:28 ` William Lee Irwin III [this message]
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