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From: Stefan Priebe <s.priebe@profihost.ag>
To: "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Cc: alexandre DERUMIER <aderumier@odiso.com>
Subject: Re: massive rbd speed decrease with latest git master
Date: Mon, 05 Nov 2012 19:48:44 +0100	[thread overview]
Message-ID: <50980A0C.7010200@profihost.ag> (raw)
In-Reply-To: <50979779.3040300@profihost.ag>

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

  parent reply	other threads:[~2012-11-05 18:48 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-05 10:39 massive rbd speed decrease with latest git master Stefan Priebe - Profihost AG
2012-11-05 10:48 ` Stefan Priebe - Profihost AG
2012-11-05 18:48 ` Stefan Priebe [this message]
2012-11-05 18:58   ` Mark Nelson
2012-11-05 19:03     ` Stefan Priebe

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