[PATCH v5 00/45] CPU hotplug: stop_machine()-free CPU hotplug

[Russell King - ARM Linux]

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 at linux.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.