From: Stefan Priebe <s.priebe@profihost.ag>
To: Greg Farnum <greg@inktank.com>
Cc: ceph-devel@vger.kernel.org
Subject: Re: how to debug slow rbd block device
Date: Tue, 22 May 2012 22:13:38 +0200 [thread overview]
Message-ID: <4FBBF372.5090300@profihost.ag> (raw)
In-Reply-To: <1C70F3FB753C4AEC97247E04FAE3C733@inktank.com>
Am 22.05.2012 21:52, schrieb Greg Farnum:
> On Tuesday, May 22, 2012 at 12:40 PM, Stefan Priebe wrote:
> Huh. That's less than I would expect. Especially since it ought to be going through the page cache.
> What version of RBD is KVM using here?
v0.47.1
> Can you (from the KVM host) run
> "rados -p data bench seq 60 -t 1"
> "rados -p data bench seq 60 -t 16"
> and paste the final output from both?
I think your meant:
rados -p data bench 60 seq -t 1 ?
but even that results in:
~# rados -p data bench 60 seq -t 1
Must write data before running a read benchmark!
error during benchmark: -2
error 2: (2) No such file or directory
Stefan
next prev parent reply other threads:[~2012-05-22 20:13 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-22 12:45 how to debug slow rbd block device Stefan Priebe - Profihost AG
2012-05-22 14:52 ` Andrey Korolyov
2012-05-22 19:27 ` Stefan Priebe
2012-05-22 19:35 ` Greg Farnum
2012-05-22 19:40 ` Stefan Priebe
2012-05-22 19:52 ` Greg Farnum
2012-05-22 20:13 ` Stefan Priebe [this message]
2012-05-22 20:30 ` Stefan Priebe
2012-05-22 20:48 ` Mark Nelson
2012-05-22 20:54 ` Stefan Priebe
2012-05-22 20:49 ` Greg Farnum
2012-05-22 21:00 ` Stefan Priebe
2012-05-22 21:11 ` Greg Farnum
2012-05-23 6:18 ` Stefan Priebe - Profihost AG
2012-05-23 6:30 ` Josh Durgin
2012-05-23 7:01 ` Stefan Priebe - Profihost AG
2012-05-23 7:19 ` Josh Durgin
2012-05-23 7:22 ` Stefan Priebe - Profihost AG
2012-05-23 7:33 ` Josh Durgin
[not found] ` <CABYiri8PXT9dpCGLE7dn=_PoW8CdLxqZF87OHe=dMXEWxogb_w@mail.gmail.com>
2012-05-23 19:54 ` Josh Durgin
2012-05-23 8:20 ` Stefan Priebe - Profihost AG
2012-05-23 8:29 ` Josh Durgin
2012-05-23 7:22 ` Andrey Korolyov
2012-05-23 8:15 ` Stefan Priebe - Profihost AG
2012-05-23 11:47 ` Mark Nelson
2012-05-23 8:30 ` Stefan Priebe - Profihost AG
2012-05-23 9:10 ` Stefan Priebe - Profihost AG
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