Re: [Patch v4 0/6] KVM: Guest page hinting

[Nitesh Narayan Lal <nilal@redhat.com>]

[-- Attachment #1.1: Type: text/plain, Size: 1276 bytes --]

Hi Rik,


On 11/12/2017 04:23 PM, Rik van Riel wrote:
> On Fri, 2017-11-03 at 16:30 -0400, nilal@redhat.com wrote:
>> The following patch-set proposes an efficient mechanism for handing
>> freed memory between the guest and the host. It enables the guests
>> with DAX (no page cache) to rapidly free and reclaim memory to and
>> from the host respectively. 
>
>> Performance:
>> 	Test criteria: Kernel Build
>> 	Command: make clean;make defconfig;time make
>> 	With Hinting:
>> 		real: 21m24.680s
>> 		user: 16m3.362s
>> 		sys : 2m19.027s
>> 	Without Hinting:
>> 		real: 21m18.062s
>> 		user: 16m13.969s
>> 		sys : 1m17.884s
>>
>> 	Test criteria: Stress Test
>> 	Command: time stress --io 2 --cpu 2 --vm 2 --vm-bytes 1024M --
>> timeout 100s -v
>> 	With Hinting:
>> 		real: 1m40.726s
>> 		user: 1m23.449s
>> 		sys : 0m5.576s
>> 	Without Hinting:
>> 		real: 1m40.378s
>> 		user: 1m21.292s
>> 		sys : 0m4.972s
> These numbers look really good, but these workloads are mostly in
> user space.
>
> Could you also try with more kernel heavy workloads, like netperf
> (sender and receiver on the same CPU, vs sender and receiver on
> different CPUs) and hackbench?
>
Yeap, I can do that. Thanks for the suggestion.

-- 
Regards
Nitesh


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]