From: "David S. Miller" <davem@redhat.com>
To: davidm@hpl.hp.com, davidm@napali.hpl.hp.com
Cc: hugh@veritas.com, linux-kernel@vger.kernel.org, andrea@suse.de,
torvalds@transmeta.com
Subject: Re: Q: PREFETCH_STRIDE/16
Date: Thu, 23 May 2002 09:21:55 -0700 (PDT) [thread overview]
Message-ID: <20020523.092155.70675460.davem@redhat.com> (raw)
In-Reply-To: <15597.6222.724619.443491@napali.hpl.hp.com>
From: David Mosberger <davidm@napali.hpl.hp.com>
Date: Thu, 23 May 2002 09:26:54 -0700
That code certainly wasn't optimized for ia64. Furthermore, I also do
not like the prefetch distance it's using. In fact, in my ia64-patch,
I use the following code instead:
prefetchw(pmd + j + PREFETCH_STRIDE/sizeof(*pmd));
This is more sensible (because it really does prefetch by the
PREFETCH_STRIDE distance) and it also happens to run (slightly) faster
on Itanium.
All of these particular prefetches are amusing, with or without your
fix, considering there are other more powerful ways to optimize this
stuff. :-)
next prev parent reply other threads:[~2002-05-23 16:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-23 15:12 Q: PREFETCH_STRIDE/16 Hugh Dickins
2002-05-23 16:26 ` David Mosberger
2002-05-23 16:21 ` David S. Miller [this message]
2002-05-23 16:43 ` David Mosberger
2002-05-23 16:34 ` David S. Miller
2002-05-23 17:02 ` David Mosberger
2002-05-23 17:00 ` David S. Miller
2002-05-23 18:32 ` David Mosberger
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