From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Nick Piggin <npiggin@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>,
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>,
Xen-devel <xen-devel@lists.xensource.com>
Subject: Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT
Date: Wed, 21 Jan 2009 14:23:13 -0800 [thread overview]
Message-ID: <4977A051.8050203@goop.org> (raw)
In-Reply-To: <20090121072718.GN24891@wotan.suse.de>
Nick Piggin wrote:
> Oh, _llc_ references/misses? Ouch.
>
> You have, what 32K L1I, 32K L1D, and 4MB L2? And even this microbenchmark
> is seeing increased L2 misses by nearly 3%. Hmm, I wonder where that is
> coming from? Instruction fetches?
>
I assume so. There should be no extra data accesses with
CONFIG_PARAVIRT (hm, there's probably some extra stack/spill traffic,
but I surely hope that's not falling out of cache).
J
next prev parent reply other threads:[~2009-01-21 22:23 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
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 [this message]
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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