linux-kernel - Re: [PATCH RFC V11 15/18] kvm : Paravirtual ticketlocks support for linux guests running on KVM hypervisor

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Date:	Fri, 2 Aug 2013 11:23:29 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	Gleb Natapov <gleb@...hat.com>, mingo@...hat.com, x86@...nel.org,
	tglx@...utronix.de, jeremy@...p.org, konrad.wilk@...cle.com,
	hpa@...or.com, pbonzini@...hat.com, linux-doc@...r.kernel.org,
	habanero@...ux.vnet.ibm.com, xen-devel@...ts.xensource.com,
	peterz@...radead.org, mtosatti@...hat.com,
	stefano.stabellini@...citrix.com, andi@...stfloor.org,
	attilio.rao@...rix.com, ouyang@...pitt.edu, gregkh@...e.de,
	agraf@...e.de, chegu_vinod@...com, torvalds@...ux-foundation.org,
	avi.kivity@...il.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, riel@...hat.com, drjones@...hat.com,
	virtualization@...ts.linux-foundation.org,
	srivatsa.vaddagiri@...il.com
Subject: Re: [PATCH RFC V11 15/18] kvm : Paravirtual ticketlocks support for
 linux guests running on KVM hypervisor


* Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> wrote:

> On 08/01/2013 02:34 PM, Raghavendra K T wrote:
> >On 08/01/2013 01:15 PM, Gleb Natapov wrote:
> >>>Shall I consider this as an ack for kvm part?
> >>>
> >>For everything except 18/18. For that I still want to see numbers. But
> >>18/18 is pretty independent from the reset of the series so it should
> >>not stop the reset from going in.
> >
> >Yes. agreed.
> >I am going to evaluate patch 18 separately and come with results for
> >that. Now we can consider only 1-17 patches.
> >
> 
> Gleb,
> 
> 32 core machine with HT off 32 vcpu guests.
> base = 3.11-rc + patch 1 -17 pvspinlock_v11
> patched = base + patch 18
> 
> +-----------+-----------+-----------+------------+-----------+
>                   dbench  (Throughput in MB/sec higher is better)
> +-----------+-----------+-----------+------------+-----------+
>       base      stdev       patched    stdev       %improvement
> +-----------+-----------+-----------+------------+-----------+
> 1x 14584.3800   146.9074   14705.1000   163.1060     0.82773
> 2x  1713.7300    32.8750    1717.3200    45.5979     0.20948
> 3x   967.8212    42.0257     971.8855    18.8532     0.41994
> 4x   685.2764    25.7150     694.5881     8.3907     1.35882
> +-----------+-----------+-----------+------------+-----------+

Please list stddev in percentage as well ...

a blind stab gave me these figures:

>       base      stdev       patched    stdev       %improvement
> 3x   967.8212    4.3%     971.8855      1.8%     0.4

That makes the improvement an order of magnitude smaller than the noise of 
the measurement ... i.e. totally inconclusive.

Also please cut the excessive decimal points: with 2-4% noise what point 
is there in 5 decimal point results??

Thanks,

	Ingo
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