Marcelo Tosatti wrote:
On Sun, Jun 01, 2008 at 12:21:29PM +0300, Avi Kivity wrote:
Marcelo Tosatti wrote:
Addressing comments on the previous patchset, follows:
- Same fake C2 emulation
- /dev/pmtimer
- Support for multiple IO bitmap pages + userspace interface
- In-kernel ACPI pmtimer emulation
Tested with Linux and WinXP guests. Also tested migration.
Do you have any performance numbers, comparing qemu/kernel/passthrough?
Test is 1 million gettimeofday calls, Xeon 1.60GHz with 4MB L2.
guest (qemu emulation):
cycles:1189759332
guest (in-kernel emulation):
cycles:628046412
guest (direct pmtimer):
cycles:230372934
host (TSC):
cycles:14862774
Ratio is 1:15:80
Looks like direct pmtimer is still quite slow. Are there any exits with
direct pmtimer, or is it all due to the ioport latency?
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