Am 05.11.2012 19:58, schrieb Mark Nelson:
On 11/05/2012 12:48 PM, Stefan Priebe wrote:
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.
Very strange. I'm curious if you continue to see this on your real test
hardware.
Yes - will report back tomorrow.
Stefan
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