linux-kernel - Re: lmbench lat_mmap slowdown with CONFIG

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Date:	Thu, 22 Jan 2009 15:30:49 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"jeremy@...source.com" <jeremy@...source.com>,
	"chrisw@...s-sol.org" <chrisw@...s-sol.org>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>
Subject: Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT

On Thu, 2009-01-22 at 15:04 -0800, Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> In any case, it is rather inefficient of me proxy-testing your patches, 
> you can do these measurements yourself too on any Core2 or later Intel 
> CPU, by running tip/master plus picking up these two utilities:

Eek, I have no time to spend on this right now, but if anyone is curious
to run this patch (which heavily breaks Xen), I suspect it will cure
most of the performance ailments.

Back when we did the VMI prototyping, we never saw any significant
benchmark reductions until the introduction of the M-to-P conversion
functions.

Zach

View attachment "paravirt-drop-mpn-ops.patch" of type "text/x-patch" (4339 bytes)