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[Xen-devel] Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT

To: Ingo Molnar <mingo@xxxxxxx>
Subject: [Xen-devel] Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 27 Jan 2009 00:24:22 -0800
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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Ingo Molnar wrote:
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.

Yep, working on it.

   J

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