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xen-devel
[Xen-devel] Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT
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To: |
Nick Piggin <npiggin@xxxxxxx> |
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Subject: |
[Xen-devel] Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Wed, 21 Jan 2009 14:23:13 -0800 |
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Cc: |
zach@xxxxxxxxxx, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, jeremy@xxxxxxxxxxxxx, rusty@xxxxxxxxxxxxxxx, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, chrisw@xxxxxxxxxxxx, hpa@xxxxxxxxx, Ingo Molnar <mingo@xxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> |
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Wed, 21 Jan 2009 14:24:40 -0800 |
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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
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