Hi S?bastien, On Thu, Aug 28, 2014 at 06:11:37PM +0200, Sebastien Han wrote: > Hey all, (...) > We have been able to reproduce this on 3 distinct platforms with some deviations (because of the hardware) but the behaviour is the same. > Any thoughts will be highly appreciated, only getting 3,2k out of an 29K IOPS SSD is a bit frustrating :). Yes, it's the OSD code running thru ~20k lines of code on every IO using ~1000 Systems-Calls for 1 real IO. Please have a look at the attached page, which I presented last Sept at SDC. => Ceph (v0.61) used 1600 mys for a 4k IO, SSD ~60 mys, Network ~20-200 mys (on v0.84 and all debug set to 0/0 it is still ~ 1100 mys) => so, tune or re-write the OSD code ... (I'm serious about this statement) Mit freundlichen Gr??en / Best regards Dieter > > Cheers. > ???? > S?bastien Han > Cloud Architect > > "Always give 100%. Unless you're giving blood." > > Phone: +33 (0)1 49 70 99 72 > Mail: sebastien.han at enovance.com > Address : 11 bis, rue Roqu?pine - 75008 Paris > Web : www.enovance.com - Twitter : @enovance > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -------------- next part -------------- A non-text attachment was scrubbed... Name: Ceph-OSD-TAT.pdf Type: application/pdf Size: 73460 bytes Desc: not available URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140829/a043eaae/attachment.pdf>
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