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

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Message-ID: <87haloiwv0.fsf@rustcorp.com.au>
Date:	Thu, 07 Feb 2013 14:44:27 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
	oleg@...hat.com, paulmck@...ux.vnet.ibm.com, mingo@...nel.org
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	akpm@...ux-foundation.org, namhyung@...nel.org,
	rostedt@...dmis.org, wangyun@...ux.vnet.ibm.com,
	xiaoguangrong@...ux.vnet.ibm.com, rjw@...k.pl, sbw@....edu,
	fweisbec@...il.com, linux@....linux.org.uk,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	walken@...gle.com
Subject: Re: [PATCH v5 00/45] CPU hotplug: stop_machine()-free CPU hotplug

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

Thanks!
Rusty.
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