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

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Message-ID: <20130208154113.GV17833@n2100.arm.linux.org.uk>
Date:	Fri, 8 Feb 2013 15:41:13 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, 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, 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 Thu, Feb 07, 2013 at 11:41:34AM +0530, Srivatsa S. Bhat wrote:
> 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 :-)

That depends what exactly you'd like tested (and how) and whether you'd
like it to be a test-chip based quad core, or an OMAP dual-core SoC.

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