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

From: Wanpeng Li
Date: Sat Aug 29 2015 - 20:21:41 EST

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! ;-)

Wanepng Li


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at