Out of curiosity, does it help much if you disable crc32c calculations?
Use the "nocrc" option in your ceph.conf file. I've had my eye on
crcutil as an alternative to how we do crc32c now.
http://code.google.com/p/crcutil/
Mark
On 11/15/2012 06:19 AM, Stefan Priebe - Profihost AG wrote:
Am 15.11.2012 12:18, schrieb Alexandre DERUMIER:
cpu usage is same for read and write ?
no for read it is just around 25%. And i get "full" (limited by rbd /
librbd) 23.000 iops per vm.
----- Mail original -----
De: "Stefan Priebe - Profihost AG" <s.priebe@xxxxxxxxxxxx>
À: ceph-devel@xxxxxxxxxxxxxxx
Envoyé: Jeudi 15 Novembre 2012 11:56:37
Objet: ceph-osd cpu usage
Hello list,
my main problem right now is that ceph does not scale for me (more vms
using rbd). It does not scale as the ceph-osd is using all my CPU core
all the time (8 cores) with just 4 SSDs. The SSDs are far away from
being loaded.
What is the best way to find out what the ceph-osd process is doing all
the time?
A gperf graph is attached.
Greets,
Stefan
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