Am 12.03.2013 um 13:02 schrieb Paolo Bonzini :
> Il 12/03/2013 12:51, Peter Lieven ha scritto:
buffer_is_zero is used in somewhat special cases (block
streaming/copy-on-read) where throughput doesn't really matter, unlike
is_dup_page/find_zero_bit which are used in migration. But
Am 12.03.2013 um 13:02 schrieb Paolo Bonzini :
> Il 12/03/2013 12:51, Peter Lieven ha scritto:
buffer_is_zero is used in somewhat special cases (block
streaming/copy-on-read) where throughput doesn't really matter, unlike
is_dup_page/find_zero_bit which are used in migration. But
Il 12/03/2013 12:51, Peter Lieven ha scritto:
>> > buffer_is_zero is used in somewhat special cases (block
>> > streaming/copy-on-read) where throughput doesn't really matter, unlike
>> > is_dup_page/find_zero_bit which are used in migration. But you can use
>> > similar code for is_dup_page and b
Am 12.03.2013 um 12:46 schrieb Paolo Bonzini :
> Il 12/03/2013 12:20, Peter Lieven ha scritto:
>>> * zero pages remain zero, and thus are only processed once
>>
>> you are right this will be the case.
>>
>>>
>>> * non-zero pages are modified often, and thus are processed multiple times.
>>>
>
Il 12/03/2013 12:20, Peter Lieven ha scritto:
>> * zero pages remain zero, and thus are only processed once
>
> you are right this will be the case.
>
>>
>> * non-zero pages are modified often, and thus are processed multiple times.
>>
>> Your patch adds overhead in the case where a page is non-z
Am 12.03.2013 um 12:11 schrieb Paolo Bonzini :
> Il 12/03/2013 11:51, Peter Lieven ha scritto:
>> Hi,
>>
>> a second patch to optimize live migration. I have generated some
>> artifical load
>> testing for zero pages. Ordinary dup or non dup pages are not affected.
>>
>> savings for zero pages
Il 12/03/2013 11:51, Peter Lieven ha scritto:
> Hi,
>
> a second patch to optimize live migration. I have generated some
> artifical load
> testing for zero pages. Ordinary dup or non dup pages are not affected.
>
> savings for zero pages (test case):
> non SSE2:30s -> 26s
> SSE2:27
Hi,
a second patch to optimize live migration. I have generated some artifical load
testing for zero pages. Ordinary dup or non dup pages are not affected.
savings for zero pages (test case):
non SSE2:30s -> 26s
SSE2:27s -> 21s
optionally I would suggest optimizing buffer_is_zero
