From: Ingo Molnar <mingo@elte.hu>
To: Manfred Spraul <manfred@colorfullife.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 4g/4g for 2.6.6
Date: Tue, 25 May 2004 21:54:37 +0200 [thread overview]
Message-ID: <20040525195437.GA10784@elte.hu> (raw)
In-Reply-To: <40B3A35D.4020702@colorfullife.com>
* Manfred Spraul <manfred@colorfullife.com> wrote:
> >also, the 4:4 overhead is really a hardware problem - and there are
> >x86-compatible CPUs (amd64) where the TLB flush problem has already been
> >solved: on amd64 the 4:4 feature has no noticeable overhead.
> >
> Do you have an idea why amd64 is better for 4g4g? Which benchmark did
> you use for testing?
i used an althlon64 CPU. amd64 is better because it has a hardware
feature that 'watches' for memory updates to cached TLBs, and it tags
the TLBs by cr3. So it can avoid having to flush those TLBs that didnt
actually change. So an amd64 CPU has in excess of 1000+ TLBs ...
Ingo
next prev parent reply other threads:[~2004-05-25 19:53 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-25 19:49 4g/4g for 2.6.6 Manfred Spraul
2004-05-25 19:54 ` Ingo Molnar [this message]
[not found] <1ZaTh-1Zx-23@gated-at.bofh.it>
[not found] ` <1ZaTh-1Zx-25@gated-at.bofh.it>
[not found] ` <1ZaTh-1Zx-27@gated-at.bofh.it>
[not found] ` <1ZaTh-1Zx-21@gated-at.bofh.it>
2004-05-24 10:27 ` Thomas Glanzmann
-- strict thread matches above, loose matches on Subject: below --
2004-05-23 19:43 Phy Prabab
2004-05-23 20:32 ` Linus Torvalds
2004-05-23 20:51 ` Jeff Garzik
2004-05-24 1:55 ` Linus Torvalds
2004-05-24 2:19 ` Jeff Garzik
2004-05-24 2:33 ` Wim Coekaerts
2004-05-31 9:51 ` Pavel Machek
2004-05-24 3:30 ` Martin J. Bligh
2004-06-01 5:52 ` Eric W. Biederman
2004-05-23 21:55 ` Phy Prabab
2004-05-24 7:05 ` Arjan van de Ven
2004-05-24 7:11 ` Phy Prabab
2004-05-24 7:24 ` Arjan van de Ven
2004-05-24 7:27 ` Phy Prabab
2004-05-24 12:01 ` Dave Jones
2004-05-24 2:39 ` William Lee Irwin III
2004-05-24 8:25 ` Ingo Molnar
2004-05-24 12:48 ` Andrea Arcangeli
2004-05-25 19:15 ` Rik van Riel
2004-05-25 19:41 ` Andrea Arcangeli
2004-05-25 19:50 ` Rik van Riel
2004-05-25 20:10 ` Rik van Riel
2004-05-25 21:15 ` Andrea Arcangeli
2004-05-25 21:16 ` Andrew Morton
2004-05-25 21:48 ` Ingo Molnar
2004-05-25 22:09 ` David S. Miller
2004-05-25 22:20 ` Ingo Molnar
2004-05-25 23:10 ` David S. Miller
2004-05-25 21:04 ` Bill Davidsen
2004-05-24 1:33 ` Martin J. Bligh
2004-05-24 1:38 ` Phy Prabab
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