On 04/23/2010 04:22 PM, Anthony Liguori wrote:
quoted text
>> I currently don't have data, but I'll prepare it.
>> There were two things I wanted to avoid.
>>
>> 1. Pages to be copied to QEMUFile buf through qemu_put_buffer.
>> 2. Calling write() everytime even when we want to send multiple pages 
>> at once.
>>
>> I think 2 may be neglectable.
>> But 1 seems to be problematic if we want make to the latency as small 
>> as possible, no?
>
>
> Copying often has strange CPU characteristics depending on whether the 
> data is already in cache.  It's better to drive these sort of 
> optimizations through performance measurement because changes are not 
> always obvious.

Copying always introduces more cache pollution, so even if the data is 
in the cache, it is worthwhile (not disagreeing with the need to measure).

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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