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Re: [Qemu-devel] [PATCH] i386: Allow monitor / mwait cpuid override
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH] i386: Allow monitor / mwait cpuid override |
Date: |
Wed, 28 Feb 2018 12:50:33 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 |
On 28/02/2018 00:55, Alexander Graf wrote:
>
>
> On 27.02.18 10:52, Gonglei (Arei) wrote:
>> Hi all,
>>
>> Guests could achive good performance in 'Message Passing Workloads'
>> scenarios when knowing the X86_FEATURE_MWAIT feature which is presented by
>> qemu.
>> the reason is that after knowing that feature,
>> the guest could use mwait method, which saves VMEXIT,
>> to do idle, and achives high performace in latency-sensitive scenario.
>>
>> Is there any plan for this patch?
>>
>> Or May I send a updated version based on yours? @Alex?
>
> Oh, did I drop the ball on this one? If that's the case, sure, go ahead.
Hi, it is probably best to implement this feature based on the
HINT_DEDICATED cpuid bit that Wanpeng Li is adding.
Paolo