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xen-devel
[Xen-devel] Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Subject: |
[Xen-devel] Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT |
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From: |
Ingo Molnar <mingo@xxxxxxx> |
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Date: |
Tue, 27 Jan 2009 08:59:12 +0100 |
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Cc: |
Zachary Amsden <zach@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "jeremy@xxxxxxxxxxxxx" <jeremy@xxxxxxxxxxxxx>, "rusty@xxxxxxxxxxxxxxx" <rusty@xxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, "chrisw@xxxxxxxxxxxx" <chrisw@xxxxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> |
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Tue, 27 Jan 2009 00:05:29 -0800 |
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References: |
<20090120112634.GA20858@xxxxxxx> <20090120140324.GA26424@xxxxxxx> <49763806.5090009@xxxxxxxx> <20090120205653.GA19710@xxxxxxx> <20090121072718.GN24891@xxxxxxxxxxxxx> <4977A051.8050203@xxxxxxxx> <1232663311.16317.176.camel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <4978F6C6.3090003@xxxxxxxx> <1232664907.16317.182.camel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <49790BCC.1040807@xxxxxxxx> |
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Mutt/1.5.18 (2008-05-17) |
* Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
>>> Also, I just posted patches to get rid of all pvops calls when
>>> fetching or setting flags in a pte, which I hope will help.
>>
>> Sounds like it will help.
>
> ...but apparently not.
ping?
This is a very serious paravirt_ops slowdown affecting the native kernel's
performance to the tune of 5-10% in certain workloads.
It's been about 2 years ago that paravirt_ops went upstream, when you told
us that something like this would never happen, that paravirt_ops is
designed so flexibly that it will never hinder the native kernel - and if
it does it will be easy to fix it. Now is the time to fulfill that
promise.
Ingo
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