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SubjectRe: [PATCH v4 00/11] KVM: x86: optimize for writing guest page
On 10/11/2011 04:36 PM, Xiao Guangrong wrote:
> On 10/09/2011 09:37 PM, Avi Kivity wrote:
>> On 10/09/2011 02:24 PM, Avi Kivity wrote:
>>> On 10/08/2011 06:06 AM, Xiao Guangrong wrote:
>>>> On 10/07/2011 01:53 AM, Marcelo Tosatti wrote:
>>>>> On Thu, Sep 22, 2011 at 04:52:40PM +0800, Xiao Guangrong wrote:
>>>>>> This patchset is against https://github.com/avikivity/kvm.git next branch.
>>>>>>
>>>>>> In this version, some changes come from Avi's comments:
>>>>>> - fix instruction retried for nested guest
>>>>>> - skip write-flooding for the sp whose level is 1
>>>>>> - rename some functions
>>>>>
>>>>> Please rebase.
>>>>>
>>>>>
>>>>
>>>> Marcelo,
>>>>
>>>> These patches can be applied without any conflict and it also works well,
>>>> the current code was pulled from https://github.com/avikivity/kvm.git next branch.
>>>>
>>>> What problem did you meet when you applied these? :(
>>>
>>> I guess it was a user error - it applies cleanly here too (and pushed to next, thanks).
>>>
>>
>> However, it seems to reduce performance.
>>
>
> Ouch, will look into it soon.

Hi Avi,

I have done kernbench tests several times on my desktop, but it shows
very well:

before patchset:
real 212.27
real 213.47
real 204.99
real 200.58
real 199.99
real 199.94
real 201.51
real 199.83
real 198.19
real 205.13

after patchset:
real 199.90
real 201.89
real 194.54
real 188.71
real 185.75
real 187.70
real 188.99
real 188.53
real 186.29
real 188.25

I will test it on our server using kvm-autotest, could you share me your
config file please?


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