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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 03.04.14 at 03:19, <konrad@xxxxxxxxxx> wrote:
> On Tue, Apr 01, 2014 at 03:29:05PM -0400, Konrad Rzeszutek Wilk wrote:
>> 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?

Iirc this was the only concern, so if you could send a proper, cleaned
up patch...

Jan


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