* [Qemu-devel] KVM VMenter/exit cost
@ 2011-10-19 23:07 Xin Tong
2011-10-20 7:55 ` 陳韋任
2012-07-05 8:51 ` chenwj
0 siblings, 2 replies; 5+ messages in thread
From: Xin Tong @ 2011-10-19 23:07 UTC (permalink / raw)
To: qemu-devel
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Currently, when amd svm or intel vmx is used to run the guest os natively on
the chip, a kernel enter and vmenter are needed, and when the guest os
executes a trapping instruction, a vmexit and kernel exit is incurred. I
would like to know the latest estimate of the cost of VMEnter/VMExit on the
Intel or AMD x86 chip and kernel enter/exit on 2.6.x linux. Any paper or
presentation on it would be great.
Thanks
Xin
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] KVM VMenter/exit cost
2011-10-19 23:07 [Qemu-devel] KVM VMenter/exit cost Xin Tong
@ 2011-10-20 7:55 ` 陳韋任
2012-07-05 8:51 ` chenwj
1 sibling, 0 replies; 5+ messages in thread
From: 陳韋任 @ 2011-10-20 7:55 UTC (permalink / raw)
To: Xin Tong; +Cc: qemu-devel
> Currently, when amd svm or intel vmx is used to run the guest os natively on
> the chip, a kernel enter and vmenter are needed, and when the guest os
> executes a trapping instruction, a vmexit and kernel exit is incurred. I
> would like to know the latest estimate of the cost of VMEnter/VMExit on the
> Intel or AMD x86 chip and kernel enter/exit on 2.6.x linux. Any paper or
> presentation on it would be great.
Try KVM mailing list instead?
http://www.linux-kvm.org/page/Lists,_IRC
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Qemu-devel] KVM VMenter/exit cost
2011-10-19 23:07 [Qemu-devel] KVM VMenter/exit cost Xin Tong
2011-10-20 7:55 ` 陳韋任
@ 2012-07-05 8:51 ` chenwj
2012-07-06 19:35 ` Xin Tong
1 sibling, 1 reply; 5+ messages in thread
From: chenwj @ 2012-07-05 8:51 UTC (permalink / raw)
To: xerox.time.tech; +Cc: qemu-devel
Hi Xin Tong,
Do you get any estimation on that?
Regards,
chenwj
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] KVM VMenter/exit cost
2012-07-05 8:51 ` chenwj
@ 2012-07-06 19:35 ` Xin Tong
2012-07-07 12:49 ` 陳韋任 (Wei-Ren Chen)
0 siblings, 1 reply; 5+ messages in thread
From: Xin Tong @ 2012-07-06 19:35 UTC (permalink / raw)
To: chenwj; +Cc: qemu-devel
yes, there is a measurement published in KVM conference.
http://www.linux-kvm.org/wiki/images/e/ea/2010-forum-mtosatti_walkthrough_entry_exit.pdf
Xin
On Thu, Jul 5, 2012 at 4:51 AM, <chenwj@iis.sinica.edu.tw> wrote:
> Hi Xin Tong,
>
> Do you get any estimation on that?
>
> Regards,
> chenwj
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] KVM VMenter/exit cost
2012-07-06 19:35 ` Xin Tong
@ 2012-07-07 12:49 ` 陳韋任 (Wei-Ren Chen)
0 siblings, 0 replies; 5+ messages in thread
From: 陳韋任 (Wei-Ren Chen) @ 2012-07-07 12:49 UTC (permalink / raw)
To: Xin Tong; +Cc: qemu-devel, chenwj
On Fri, Jul 06, 2012 at 03:35:05PM -0400, Xin Tong wrote:
> yes, there is a measurement published in KVM conference.
>
> http://www.linux-kvm.org/wiki/images/e/ea/2010-forum-mtosatti_walkthrough_entry_exit.pdf
I also found VMWare has result on VMEnrt/VMExit cost.
http://labs.vmware.com/download/139/
The cost is quite high, ~800 cycles.
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
^ permalink raw reply [flat|nested] 5+ messages in thread
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2011-10-19 23:07 [Qemu-devel] KVM VMenter/exit cost Xin Tong
2011-10-20 7:55 ` 陳韋任
2012-07-05 8:51 ` chenwj
2012-07-06 19:35 ` Xin Tong
2012-07-07 12:49 ` 陳韋任 (Wei-Ren Chen)
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