Am 05.11.2012 11:39, schrieb Stefan Priebe - Profihost AG:
Hello list,
while updating ceph to the latest master i noticed this:
Commit a01b112d71a0b6a1bb206d53867d13536d17bbf6:
rand. 4k WRITE: 3000 iop/s
Commit 72a710ac47355ae3ca1d055be1496c91956d549d:
rand. 4k WRITE: 900 iop/s
Same for rand 4k read - haven't tested sequential stuff.
OK i found out what the issue is. I get 900 iop/s when compiled with
syncfs support and i get 3000-6000 iop/s when compiled without syncfs
support.
Strange shouldn't syncfs improve the performance?
Note: ceph is running inside KVM right now for testing with an iscsi
based backend storage. My real testhw will arrive tomorrow.
Greets,
Stefan
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