Re: [Xen-devel] [PATCH v2] Xen: Spread boot time page scrubbing across all available CPU's

[Tim Deegan <tim@xxxxxxx>]

At 21:19 -0400 on 02 Apr (1396469958), Konrad Rzeszutek Wilk wrote:
> On Tue, Apr 01, 2014 at 03:29:05PM -0400, Konrad Rzeszutek Wilk wrote:
> > Is there an updated version of this patch?
> > 
> > My recollection is that Jan wanted this patch to spread the work
> > only on the cores and not the threads. Were there any other concerns?
> 
> And for fun I tried it on a large box and it does make a difference.
> 
> With the patch (attached) where we only use the cores and skip
> the SMT threads the boot time scrubbing for 1.5TB is 66 seconds
> while for all of the CPUs (including threads) is 127 seconds.
> 
> Sorry about the quality of the patch - was poking at it while
> on conference calls so please treat it as HACK/RFC.
> 
> Jan/Malcom, were there any other issues that needed to be addressed?

Yes: http://lists.xen.org/archives/html/xen-devel/2013-10/msg00131.html

Tim.

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