From: Andi Kleen <ak@suse.de>
To: "David S. Miller" <davem@redhat.com>
Cc: torvalds@osdl.org, linux-arch@vger.kernel.org
Subject: Re: clear_user_highpage()
Date: Thu, 12 Aug 2004 11:09:24 +0200 [thread overview]
Message-ID: <20040812110924.0713f5d9.ak@suse.de> (raw)
In-Reply-To: <20040811194545.0034428b.davem@redhat.com>
On Wed, 11 Aug 2004 19:45:45 -0700
"David S. Miller" <davem@redhat.com> wrote:
> On Thu, 12 Aug 2004 04:08:25 +0200
> Andi Kleen <ak@suse.de> wrote:
>
> > I discovered this the hard way on Opteron too. At some point
> > I was doing clear_page using cache bypassing write combining stores.
> > That was done because it was faster in microbenchmarks that just
> > tested the function. But on actual macro benchmarks it was quite
> > bad because the applications were eating cache misses all the time.
>
> Do these cache-bypassing stores use the L2 cache on a hit?
No, they invalidate the cache.
-Andi
next prev parent reply other threads:[~2004-08-12 9:09 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-11 23:15 clear_user_highpage() David S. Miller
2004-08-11 23:31 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-11 23:55 ` clear_user_highpage() David S. Miller
2004-08-12 0:03 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-12 1:18 ` clear_user_highpage() William Lee Irwin III
2004-08-12 2:11 ` clear_user_highpage() Andi Kleen
2004-08-12 9:23 ` clear_user_highpage() Martin Schwidefsky
2004-08-11 23:46 ` clear_user_highpage() Linus Torvalds
2004-08-11 23:53 ` clear_user_highpage() David S. Miller
2004-08-12 0:00 ` clear_user_highpage() Linus Torvalds
2004-08-12 0:06 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-12 0:24 ` clear_user_highpage() David S. Miller
2004-08-12 0:23 ` clear_user_highpage() David S. Miller
2004-08-12 1:46 ` clear_user_highpage() Linus Torvalds
2004-08-12 2:51 ` clear_user_highpage() David S. Miller
2004-08-16 1:58 ` clear_user_highpage() Paul Mackerras
2004-08-12 2:08 ` clear_user_highpage() Andi Kleen
2004-08-12 2:45 ` clear_user_highpage() David S. Miller
2004-08-12 9:09 ` Andi Kleen [this message]
2004-08-12 19:50 ` clear_user_highpage() David S. Miller
2004-08-12 20:00 ` clear_user_highpage() Andi Kleen
2004-08-12 20:30 ` clear_user_highpage() David S. Miller
2004-08-12 21:34 ` clear_user_highpage() Matthew Wilcox
2004-08-13 8:16 ` clear_user_highpage() David Mosberger
2004-08-12 0:00 ` clear_user_highpage() Benjamin Herrenschmidt
2004-08-12 0:21 ` clear_user_highpage() Linus Torvalds
2004-08-12 0:46 ` clear_user_highpage() William Lee Irwin III
2004-08-12 1:01 ` clear_user_highpage() David S. Miller
2004-08-12 2:18 ` clear_user_highpage() Linus Torvalds
2004-08-12 2:43 ` clear_user_highpage() David S. Miller
2004-08-12 4:19 ` clear_user_highpage() Linus Torvalds
2004-08-12 4:46 ` clear_user_highpage() William Lee Irwin III
2004-08-15 6:22 ` clear_user_highpage() Andrew Morton
2004-08-15 6:38 ` clear_user_highpage() William Lee Irwin III
2004-08-12 2:57 ` clear_user_highpage() David S. Miller
2004-08-12 3:20 ` clear_user_highpage() William Lee Irwin III
2004-08-13 21:41 ` clear_user_highpage() David S. Miller
2004-08-16 13:00 ` clear_user_highpage() David Mosberger
2004-08-22 19:51 ` clear_user_highpage() Linus Torvalds
2005-09-17 19:01 ` clear_user_highpage() Andi Kleen
2005-09-17 19:16 ` clear_user_highpage() Andi Kleen
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