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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 /migration/savevm.c | |
| parent | e0d138aa9b3a4c72fe8bca735686132fdea646b7 (diff) | |
| download | qemu-bb70b66ed7a5600a63437fb6d64dedb44f670e58.zip qemu-bb70b66ed7a5600a63437fb6d64dedb44f670e58.tar.gz qemu-bb70b66ed7a5600a63437fb6d64dedb44f670e58.tar.bz2 | |
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 'migration/savevm.c')
0 files changed, 0 insertions, 0 deletions