linux-kernel - Re: [PATCH v3 0/7] Dynamic Pause Loop Exiting window.

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Message-ID: <20140825151123.GA16532@potion.brq.redhat.com>
Date:	Mon, 25 Aug 2014 17:11:23 +0200
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	Wanpeng Li <wanpeng.li@...ux.intel.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Gleb Natapov <gleb@...nel.org>,
	Raghavendra KT <raghavendra.kt@...ux.vnet.ibm.com>,
	Vinod Chegu <chegu_vinod@...com>,
	Hui-Zhi Zhao <hui-zhi.zhao@...com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Lisa Mitchell <lisa.mitchell@...com>
Subject: Re: [PATCH v3 0/7] Dynamic Pause Loop Exiting window.

2014-08-22 12:45+0800, Wanpeng Li:
> Hi Radim,
> On Thu, Aug 21, 2014 at 06:50:03PM +0200, Radim Krčmář wrote:
> >2014-08-21 18:30+0200, Paolo Bonzini:
> >> Il 21/08/2014 18:08, Radim Krčmář ha scritto:
> >> I'm not sure of the usefulness of patch 6, so I'm going to drop it.
> >> I'll keep it in my local junkyard branch in case it's going to be useful
> >> in some scenario I didn't think of.
> >
> >I've been using it to benchmark different values, because it is more
> 
> Is there any benchmark data for this patchset?

Sorry, I already returned the testing machine and it wasn't quality
benchmarking, so I haven't kept the results ...

I used ebizzy and dbench, because ebizzy had large difference between
PLE on/off and dbench minimal (without overcommit), so one was looking
for improvements while the other was checking regressions.
(And they are easy to set up.)

>From what I remember, this patch had roughly 5x better performance with
ebizzy on 60 VCPU guests and no obvious difference for dbench.
(And improvement under overcommit was visible for both.)

There was a significant reduction in %sys, which never raised much above
30%, as oposed to original 90%+.
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