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Re: [Xen-devel] Re: [PATCH] Allow removing writable mappings from splint

To: deshantm@xxxxxxxxx
Subject: Re: [Xen-devel] Re: [PATCH] Allow removing writable mappings from splintered page tables.
From: "George Dunlap" <George.Dunlap@xxxxxxxxxxxxx>
Date: Mon, 15 Sep 2008 11:38:19 +0100
Cc: Gianluca Guida <gianluca.guida@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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And your original numbers showed elapsed time to be 527s for KVM, so
now Xen is 8 seconds in the lead for HVM Linux. :-)  Thanks for the
help tracking this down!

If you have time, could you take another 30-second trace with the new
changes in, just for fun?  I'll take a quick look and see if there's
any other low-hanging fruit to grab.


On Fri, Sep 12, 2008 at 8:52 PM, Todd Deshane <deshantm@xxxxxxxxx> wrote:
> On Fri, Sep 12, 2008 at 1:14 PM, Gianluca Guida
> <gianluca.guida@xxxxxxxxxxxxx> wrote:
>> Todd Deshane wrote:
>>>> Todd: Can you try try the linux-2.6.27 kernbench with the following
>>>> patch?
>>>> Also, are you using ioemu stub-domains? That should also give a
>>>> performance
>>>> gain.
>>> Sure, I can give it a try. Should I also apply George's patch right?
> Much faster, I'll also test on debian 4.0 for a regression test.
> Average Optimal load -j 4 Run (std deviation):
> Elapsed Time 519.056 (0.098387)
> User Time 426.226 (0.815555)
> System Time 92.716 (0.858563)
> Percent CPU 99 (0)
> Context Switches 99125.2 (71.3667)
> Sleeps 31199.2 (41.3062)
> I also want to look into the ioemu stub domains after reading more about them.
> I'll report the debian (older kernel results) when they come out.
> Todd
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