From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <npiggin@suse.de>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
hpa@zytor.com, jeremy@xensource.com, chrisw@sous-sol.org,
zach@vmware.com, rusty@rustcorp.com.au,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT
Date: Tue, 20 Jan 2009 16:13:47 +0100 [thread overview]
Message-ID: <20090120151347.GA4309@elte.hu> (raw)
In-Reply-To: <20090120140324.GA26424@elte.hu>
* Ingo Molnar <mingo@elte.hu> wrote:
> That shows the expected $cache risks here as well: i ran this on an
> Extreme Edition CPU which has a ton of L2 cache [4MB] which mutes L2
> $cache misses quite a bit.
[ there's no such thing as "L2 $cache misses" - what i wanted to say is
that while the instruction cache size is rather small and static, a
large L2 cache helps in keeping the costs of instruction-cache misses
low - hence my measurement skews in favor of paravirt. ]
Ingo
next prev parent reply other threads:[~2009-01-20 15:14 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-20 11:05 lmbench lat_mmap slowdown with CONFIG_PARAVIRT Nick Piggin
2009-01-20 11:26 ` Ingo Molnar
2009-01-20 12:34 ` Nick Piggin
2009-01-20 12:45 ` Ingo Molnar
2009-01-20 13:41 ` Nick Piggin
2009-01-20 14:03 ` Ingo Molnar
2009-01-20 14:14 ` Nick Piggin
2009-01-20 14:17 ` Ingo Molnar
2009-01-20 14:41 ` Nick Piggin
2009-01-20 15:00 ` Ingo Molnar
2009-01-20 15:13 ` Ingo Molnar [this message]
2009-01-20 19:37 ` Ingo Molnar
2009-01-20 20:45 ` Jeremy Fitzhardinge
2009-01-20 20:56 ` Ingo Molnar
2009-01-21 7:27 ` Nick Piggin
2009-01-21 22:23 ` Jeremy Fitzhardinge
2009-01-22 22:28 ` Zachary Amsden
2009-01-22 22:44 ` Jeremy Fitzhardinge
2009-01-22 22:49 ` H. Peter Anvin
2009-01-22 22:58 ` Zachary Amsden
2009-01-22 23:52 ` H. Peter Anvin
2009-01-23 0:08 ` Jeremy Fitzhardinge
2009-01-22 22:55 ` Zachary Amsden
2009-01-23 0:14 ` Jeremy Fitzhardinge
2009-01-27 7:59 ` Ingo Molnar
2009-01-27 8:24 ` Jeremy Fitzhardinge
2009-01-27 10:17 ` Jeremy Fitzhardinge
2009-01-20 19:05 ` Zachary Amsden
2009-01-20 19:31 ` Ingo Molnar
2009-01-22 22:26 ` Jeremy Fitzhardinge
2009-01-22 23:04 ` Ingo Molnar
2009-01-22 23:30 ` Zachary Amsden
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