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

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Message-ID: <51FB25DF.5000203@linux.vnet.ibm.com>
Date:	Fri, 02 Aug 2013 08:52:07 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Gleb Natapov <gleb@...hat.com>, mingo@...hat.com
CC:	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

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
+-----------+-----------+-----------+------------+-----------+

I saw -0.78% - .84% changes in ebizzy and 1-2% improvement in
hackbench.

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