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| author | Lukas Straub <lukasstraub2@web.de> | 2020-05-11 13:10:44 +0200 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2020-06-01 18:44:27 +0100 |
| commit | bb70b66ed7a5600a63437fb6d64dedb44f670e58 (patch) | |
| tree | dcac9bc50eb0326987316259efe0b8de4e210cd1 /python/qemu/qtest.py | |
| parent | e0d138aa9b3a4c72fe8bca735686132fdea646b7 (diff) | |
| download | focaccia-qemu-bb70b66ed7a5600a63437fb6d64dedb44f670e58.tar.gz focaccia-qemu-bb70b66ed7a5600a63437fb6d64dedb44f670e58.zip | |
migration/colo.c: Use event instead of semaphore
If multiple packets miscompare in a short timeframe, the semaphore value will be increased multiple times. This causes multiple checkpoints even if one would be sufficient. Fix this by using a event instead of a semaphore for triggering checkpoints. Now, checkpoint requests will be ignored until the checkpoint event is sent to colo-compare (which releases the miscompared packets). Benchmark results (iperf3): Client-to-server tcp: without patch: ~66 Mbit/s with patch: ~61 Mbit/s Server-to-client tcp: without patch: ~702 Kbit/s with patch: ~16 Mbit/s Signed-off-by: Lukas Straub <lukasstraub2@web.de> Message-Id: <fd601ba1beb524aada54ba66e87ebfc12cf4574b.1589193382.git.lukasstraub2@web.de> Reviewed-by: zhanghailiang <zhang.zhanghailiang@huawei.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'python/qemu/qtest.py')
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