linux-kernel - Re: [PATCH v4 0/3] KVM: Dynamic Halt-Polling

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Date:	Sun, 30 Aug 2015 08:21:06 +0800
From:	Wanpeng Li <wanpeng.li@...mail.com>
To:	Peter Kieser <peter@...ser.ca>
CC:	Paolo Bonzini <pbonzini@...hat.com>,
	David Matlack <dmatlack@...gle.com>, kvm <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 0/3] KVM: Dynamic Halt-Polling

On 8/30/15 8:13 AM, Peter Kieser wrote:
> On 2015-08-29 4:55 PM, Wanpeng Li wrote:
>> On 8/30/15 6:26 AM, Peter Kieser wrote:
>>> Thanks, Wanpeng. Applied this to Linux 3.18 and seeing much higher 
>>> CPU usage (200%) for qemu 2.4.0 process on a Windows 10 x64 guest. 
>>> qemu parameters:
>>
>> Thanks for the report. If Paolo's patch "kvm: add halt_poll_ns module 
>> parameter" is applied on your 3.18? Btw, do you test the linux guest? 
>
> No high CPU usage on Linux guests. 

What's the difference w/ and w/o the patchset?

> Following patch series are applied (in order):
>
> * kvm: add halt_poll_ns module parameter
> * KVM: make halt_poll_ns static
> * KVM: Dynamic Halt-Polling v4
>

I will find a windows 10 x64 guest to figure out what happens tomorrow. 
Do you test other windows guest(like win7)? Btw, could you test v3 
dynamic halt-polling(against windows 10 guest) which David gives the 
shrink/grow logic different with v4. Many thanks for your time, Peter! ;-)

Regards,
Wanepng Li

> -Peter
>
>

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