From: Stefan Priebe <s.priebe@profihost.ag>
To: Stefan Majer <stefan.majer@gmail.com>
Cc: Mark Nelson <mark.nelson@inktank.com>,
"ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: Re: poor OSD performance using kernel 3.4
Date: Wed, 30 May 2012 23:10:02 +0200 [thread overview]
Message-ID: <4FC68CAA.9030708@profihost.ag> (raw)
In-Reply-To: <CADdPHGuxa7TAyqXcXehb9WgKgkHwkybYTrj2oue_PKsiF+oR3A@mail.gmail.com>
Am 30.05.2012 20:47, schrieb Stefan Majer:
> From my perspective marks hints regarding blktrace end up in the same
> summary as the iostat ouput gives.
> You see stalls, not induced by disk by any means, no other obvious hints
> where the lag might come from.
> So if you want to know why kernels > 3.2 are slow for your workload i
> would drill down this with git bisect.
OK here are some tests regarding the kernel version - all made with XFS.
Starting with 3.2.0-rc1 it drops from 164MB/s (bonding) to 119MB/s but
it never goes down to 0MB/s. 3.2.18 shows the same as 3.2-rc1.
Then with 3.3-rc1 i'm seeing even faster speed (178MB/s) than with 3.0.X
- so everything is fine again. So it seems 3.2.X had another bug which
reduced the speed which was fixed in 3.3.
Beginning with 3.3-rc4 it get's bad with drops to 0MB/s. So it should be
a commit between 3.3-rc3 and 3.3-rc4. Sadly this are 370 commits. No
idea where to start.
Stefan
next prev parent reply other threads:[~2012-05-30 21:10 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-24 14:10 poor OSD performance using kernel 3.4 Stefan Priebe - Profihost AG
2012-05-24 14:57 ` Mark Nelson
[not found] ` <CAJCPpW+SKnnVUaDEAsCkKyZwMVrHCRJF2C8zqB4eORgwW5p=1Q@mail.gmail.com>
[not found] ` <4FBE7ABC.5020502@profihost.ag>
2012-05-24 18:53 ` Mark Nelson
2012-05-24 19:05 ` Stefan Priebe
2012-05-25 1:53 ` Mark Nelson
2012-05-25 8:19 ` Stefan Priebe - Profihost AG
2012-05-25 11:31 ` Stefan Priebe - Profihost AG
2012-05-25 12:10 ` Stefan Priebe - Profihost AG
2012-05-25 15:47 ` Alexandre DERUMIER
2012-05-27 9:11 ` Stefan Priebe - Profihost AG
2012-05-27 11:33 ` Alexandre DERUMIER
2012-05-27 18:57 ` Stefan Priebe
2012-05-28 5:37 ` Alexandre DERUMIER
2012-05-28 6:25 ` Stefan Priebe
2012-05-28 6:52 ` Alexandre DERUMIER
2012-05-28 19:48 ` Stefan Priebe
2012-05-29 3:54 ` Alexandre DERUMIER
2012-05-29 8:22 ` Stefan Priebe - Profihost AG
2012-05-29 13:01 ` Alexandre DERUMIER
2012-05-29 14:18 ` Stefan Priebe - Profihost AG
2012-05-29 9:46 ` Stefan Priebe - Profihost AG
2012-05-29 13:39 ` Yann Dupont
2012-05-29 14:43 ` Stefan Priebe - Profihost AG
2012-05-29 17:50 ` Mark Nelson
2012-05-29 19:50 ` Yann Dupont
2012-05-29 21:04 ` Stefan Priebe
2012-05-29 21:08 ` Stefan Priebe
2012-05-29 21:31 ` Yann Dupont
2012-05-29 21:34 ` Stefan Priebe
2012-05-29 21:45 ` Yann Dupont
2012-05-30 6:29 ` Stefan Priebe - Profihost AG
2012-05-29 21:41 ` Mark Nelson
2012-05-30 6:22 ` Stefan Priebe - Profihost AG
2012-05-30 7:20 ` building test cluster : missing /etc/ceph/client.admin.keyring, need help Alexandre DERUMIER
2012-05-30 7:25 ` Stefan Priebe - Profihost AG
2012-05-30 7:33 ` Alexandre DERUMIER
2012-05-30 7:47 ` Alexandre DERUMIER
2012-05-29 22:25 ` poor OSD performance using kernel 3.4 Mark Nelson
2012-05-30 6:33 ` Stefan Priebe - Profihost AG
[not found] ` <CADdPHGs9dpSh9Oyu+5yDhyYU=Et_-zF5MuYybBuuAN5DgR433A@mail.gmail.com>
2012-05-30 7:16 ` Stefan Priebe - Profihost AG
[not found] ` <CADdPHGuiJqZUCK-0qR_CrOo6GRhkjaCdkOhJ2boq3zD0_voTsA@mail.gmail.com>
2012-05-30 11:04 ` Stefan Priebe - Profihost AG
[not found] ` <CADdPHGuLAL5+hkzq0tigqu355DvPxkhE5sxBhOVZPj=EzDSVtA@mail.gmail.com>
2012-05-30 11:25 ` Stefan Priebe - Profihost AG
2012-05-30 12:17 ` Mark Nelson
2012-05-30 12:41 ` Stefan Priebe - Profihost AG
[not found] ` <CADdPHGsmr8Ht1pTWH1Oe8=NmAyM81SSdH+c_GV89D8ntfyUmgA@mail.gmail.com>
2012-05-30 13:19 ` Stefan Priebe - Profihost AG
[not found] ` <CADdPHGvxCmuViy+0==Vkdz_QjC1K+kD5kD1m7+0tYM2YDTtJbw@mail.gmail.com>
2012-05-30 13:54 ` Stefan Priebe - Profihost AG
[not found] ` <4FC63381.6090300@inktank.com>
2012-05-30 14:53 ` Stefan Priebe
2012-05-30 14:56 ` Mark Nelson
2012-05-30 18:26 ` Stefan Priebe
2012-05-30 19:41 ` Mark Nelson
2012-05-30 13:27 ` Mark Nelson
2012-05-30 13:51 ` Stefan Priebe - Profihost AG
2012-05-30 14:16 ` Mark Nelson
2012-05-30 18:42 ` Stefan Priebe
[not found] ` <CADdPHGuxa7TAyqXcXehb9WgKgkHwkybYTrj2oue_PKsiF+oR3A@mail.gmail.com>
2012-05-30 21:10 ` Stefan Priebe [this message]
[not found] ` <CADdPHGutEwoDc=Kcrqcx2ZMO=dqhuoT5iLoP-WxqD+e5ZUmBRA@mail.gmail.com>
2012-05-31 7:10 ` poor OSD performance using kernel 3.4 => problem found Stefan Priebe - Profihost AG
2012-05-31 7:30 ` Yehuda Sadeh
[not found] ` <CADdPHGtz9Jq624DMO6Dve2AcJ9vrnFHbyqRa+qheA+0-y4k++g@mail.gmail.com>
2012-05-31 12:31 ` Mark Nelson
2012-05-31 12:33 ` Stefan Priebe - Profihost AG
2012-05-31 13:21 ` Yann Dupont
2012-05-31 13:37 ` Stefan Priebe - Profihost AG
2012-05-31 13:45 ` Yann Dupont
2012-05-31 14:42 ` Yann Dupont
2012-05-31 15:32 ` Mark Nelson
2012-05-31 15:43 ` Yann Dupont
2012-05-31 16:14 ` Mark Nelson
2012-05-31 16:29 ` Sage Weil
2012-05-31 16:37 ` Yann Dupont
[not found] ` <CADdPHGv0YjxDQFnZML-55jDj7XxHxaxUZ_FeQ=ReKK6Rs7NNhw@mail.gmail.com>
2012-05-31 8:04 ` Stefan Priebe - Profihost AG
2012-05-31 8:09 ` Stefan Majer
2012-05-31 11:34 ` Stefan Priebe - Profihost AG
2012-05-31 12:18 ` Stefan Priebe - Profihost AG
2012-05-30 11:51 ` poor OSD performance using kernel 3.4 Mark Nelson
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