Message-ID: <4FA7AAD8.6050003@linux.vnet.ibm.com>
Date: Mon, 07 May 2012 16:28:32 +0530
From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Organization: IBM
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To: Avi Kivity <avi@redhat.com>, Ingo Molnar <mingo@kernel.org>
CC: Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jeremy Fitzhardinge <jeremy@goop.org>,
        Greg Kroah-Hartman <gregkh@suse.de>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Marcelo Tosatti <mtosatti@redhat.com>, X86 <x86@kernel.org>,
        Gleb Natapov <gleb@redhat.com>, Ingo Molnar <mingo@redhat.com>,
        Attilio Rao <attilio.rao@citrix.com>,
        Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
        Virtualization <virtualization@lists.linux-foundation.org>,
        Xen Devel <xen-devel@lists.xensource.com>, linux-doc@vger.kernel.org,
        KVM <kvm@vger.kernel.org>, Andi Kleen <andi@firstfloor.org>,
        Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
        Stephan Diestelhorst <stephan.diestelhorst@amd.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks
References: <20120502100610.13206.40.sendpatchset@codeblue.in.ibm.com> <20120507082928.GI16608@gmail.com> <4FA7888F.80505@redhat.com>
In-Reply-To: <4FA7888F.80505@redhat.com>
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On 05/07/2012 02:02 PM, Avi Kivity wrote:
> On 05/07/2012 11:29 AM, Ingo Molnar wrote:
>> This is looking pretty good and complete now - any objections
>> from anyone to trying this out in a separate x86 topic tree?
>
> No objections, instead an
>
> Acked-by: Avi Kivity<avi@redhat.com>
>

Thank you.

Here is a benchmark result with the patches.

3 guests with 8VCPU, 8GB RAM, 1 used for kernbench
(kernbench -f -H -M -o 20) other for cpuhog (shell script while
true with an instruction)

unpinned scenario
1x: no hogs
2x: 8hogs in one guest
3x: 8hogs each in two guest

BASE: 3.4-rc4 vanilla with CONFIG_PARAVIRT_SPINLOCK=n
BASE+patch: 3.4-rc4 + debugfs + pv patches with CONFIG_PARAVIRT_SPINLOCK=y

Machine : IBM xSeries with Intel(R) Xeon(R) x5570 2.93GHz CPU (Non PLE) 
with 8 core , 64GB RAM

(Less is better. Below is time elapsed in sec for x86_64_defconfig (3+3 
runs)).

		 BASE                    BASE+patch            %improvement
		 mean (sd)               mean (sd)
case 1x:	 66.0566 (74.0304) 	 61.3233 (68.8299) 	7.16552
case 2x:	 1253.2 (1795.74) 	 131.606 (137.358) 	89.4984
case 3x:	 3431.04 (5297.26) 	 134.964 (149.861) 	96.0664


Will be working on further analysis with other benchmarks 
(pgbench/sysbench/ebizzy...) and further optimization.

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