From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance)
Date: 18 Mar 2003 16:42:29 -0800 [thread overview]
Message-ID: <b58edl$au1$1@cesium.transmeta.com> (raw)
In-Reply-To: Pine.LNX.4.44.0303181113590.13708-100000@home.transmeta.com
Followup to: <Pine.LNX.4.44.0303181113590.13708-100000@home.transmeta.com>
By author: Linus Torvalds <torvalds@transmeta.com>
In newsgroup: linux.dev.kernel
>
> Wow. There aren't many things that AMD tends to show the P4-like "big
> latency in rare cases" behaviour.
>
> But quite honestly, I think they made the right call, and I _expect_ that
> of modern CPU's. The fact is, modern CPU's tend to need to pre-decode the
> instruction stream some way, and storing to it while running from it is
> just a really really bad idea. And since it's so easy to avoid it, you
> really just shouldn't do it.
>
AMD, I believe, has an "annotated" icache.
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
Architectures needed: ia64 m68k mips64 ppc ppc64 s390 s390x sh v850 x86-64
next prev parent reply other threads:[~2003-03-19 0:32 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-12 1:35 [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance) Martin J. Bligh
2003-02-12 2:59 ` Dave Jones
2003-02-12 4:21 ` Jamie Lokier
2003-02-12 5:49 ` Linus Torvalds
2003-02-12 10:12 ` Jamie Lokier
2003-03-10 3:07 ` Linus Torvalds
2003-03-10 11:06 ` Andi Kleen
2003-03-10 18:33 ` Linus Torvalds
2003-03-10 22:44 ` Linus Torvalds
2003-02-12 12:54 ` Dave Jones
2003-02-12 7:50 ` Andi Kleen
2003-02-12 10:27 ` Jamie Lokier
2003-02-12 10:45 ` Andi Kleen
2003-02-12 17:52 ` Ingo Oeser
2003-02-12 18:13 ` Dave Jones
2003-02-12 18:18 ` Andi Kleen
2003-02-13 2:42 ` Alan Cox
2003-02-13 5:17 ` Eric W. Biederman
2003-02-13 18:07 ` Andi Kleen
2003-02-14 0:14 ` [discuss] " Peter Tattam
2003-02-14 1:29 ` Andi Kleen
2003-02-14 1:51 ` Eric Northup
2003-02-14 2:01 ` Peter Tattam
2003-02-14 4:07 ` Thomas J. Merritt
2003-02-14 9:38 ` Peter Finderup Lund
2003-02-14 8:27 ` Eric W. Biederman
2003-03-19 1:22 ` Rob Landley
2003-02-12 4:18 ` Jamie Lokier
2003-02-12 5:54 ` Linus Torvalds
2003-02-12 10:18 ` Jamie Lokier
2003-02-12 17:24 ` Linus Torvalds
2003-03-18 15:24 ` Kevin Pedretti
2003-03-18 16:41 ` Linus Torvalds
2003-03-18 18:30 ` Brian Gerst
2003-03-18 19:14 ` Thomas Molina
2003-03-18 19:21 ` Linus Torvalds
2003-03-18 20:03 ` Thomas Schlichter
2003-03-18 20:24 ` Steven Cole
2003-03-19 0:42 ` H. Peter Anvin [this message]
2003-03-19 2:22 ` george anzinger
[not found] <20030318165013$55f4@gated-at.bofh.it>
[not found] ` <20030318184010$6448@gated-at.bofh.it>
2003-03-18 20:19 ` Pascal Schmidt
-- strict thread matches above, loose matches on Subject: below --
2003-03-19 9:55 Ph. Marek
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