linux-kernel - Re: [PATCH v5 00/45] CPU hotplug: stop

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Message-ID: <51134596.4080106@linux.vnet.ibm.com>
Date:	Thu, 07 Feb 2013 11:41:34 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
	oleg@...hat.com, paulmck@...ux.vnet.ibm.com, mingo@...nel.org,
	linux-arch@...r.kernel.org, linux@....linux.org.uk,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	fweisbec@...il.com, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	xiaoguangrong@...ux.vnet.ibm.com, rjw@...k.pl, sbw@....edu,
	wangyun@...ux.vnet.ibm.com, netdev@...r.kernel.org,
	namhyung@...nel.org, akpm@...ux-foundation.org, walken@...gle.com,
	linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 00/45] CPU hotplug: stop_machine()-free CPU hotplug

On 02/07/2013 09:44 AM, Rusty Russell wrote:
> "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com> writes:
>> On 01/22/2013 01:03 PM, Srivatsa S. Bhat wrote:
>>                  Avg. latency of 1 CPU offline (ms) [stop-cpu/stop-m/c latency]
>>
>> # online CPUs    Mainline (with stop-m/c)       This patchset (no stop-m/c)
>>
>>       8                 17.04                          7.73
>>
>>      16                 18.05                          6.44
>>
>>      32                 17.31                          7.39
>>
>>      64                 32.40                          9.28
>>
>>     128                 98.23                          7.35
> 
> Nice!

Thank you :-)

>  I wonder how the ARM guys feel with their quad-cpu systems...
> 

That would be definitely interesting to know :-)

Regards,
Srivatsa S. Bhat

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