From: Ingo Molnar <mingo@elte.hu>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Zachary Amsden <zach@vmware.com>, Nick Piggin <npiggin@suse.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
"hpa@zytor.com" <hpa@zytor.com>,
"jeremy@xensource.com" <jeremy@xensource.com>,
"chrisw@sous-sol.org" <chrisw@sous-sol.org>,
"rusty@rustcorp.com.au" <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: Tue, 27 Jan 2009 08:59:12 +0100 [thread overview]
Message-ID: <20090127075912.GA6551@elte.hu> (raw)
In-Reply-To: <49790BCC.1040807@goop.org>
* Jeremy Fitzhardinge <jeremy@goop.org> 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
next prev parent reply other threads:[~2009-01-27 8:05 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
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 [this message]
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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