These two patches allow to batch writes to MMIO.
When kernel has to send MMIO writes to userspace, it stores them
in memory until it has to pass the hand to userspace for another
reason. This avoids to have too many context switches on operations
that can wait.
These patches introduce an ioctl() to define MMIO allowed to be delayed.
I made some bentchmark with iperf and e1000:
average on 10 runs
WITH WITHOUT
PATCH PATCH
257.2 MB/s 193.7 MB/s 33% faster
I've measured host_state_reload on WinXP boot:
WITH WITHOUT
PATCH PATCH
561397 739708 24% less
I've measured host_state_reload on a VGA text scroll:
WITH WITHOUT
PATCH PATCH
3976242 13779849 70% less...
[PATCH 1/2] kvm: Batch writes to MMIO
- kernel part
[PATCH 2/2] kvm-userspace: Batch writes to MMIO
- userspace part
Signed-off-by: Laurent Vivier <[EMAIL PROTECTED]>
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