On 04/23/2010 04:22 PM, Anthony Liguori wrote:
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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