From: Corrado Zoccolo <czoccolo@gmail.com>
To: Linux-Kernel <linux-kernel@vger.kernel.org>,
knikanth@suse.de, jens.axboe@oracle.com
Subject: [bisected] commit: a9327cac440be4d8333bba975cbbf76045096275 causes iostat output
Date: Sun, 4 Oct 2009 12:49:19 +0200 [thread overview]
Message-ID: <4e5e476b0910040349l21b69a97o7a11b2138bc8f573@mail.gmail.com> (raw)
Hi,
with 2.6.32-rc1 I started getting the following strange output from
"iostat -kx 2":
Linux 2.6.31bisect (et2) 04/10/2009 _i686_ (2 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
10,70 0,00 3,16 15,75 0,00 70,38
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await svctm %util
sda 18,22 0,00 0,67 0,01 14,77 0,02
43,94 0,01 10,53 39043915,03 2629219,87
sdb 60,89 9,68 50,79 3,04 1724,43 50,52
65,95 0,70 13,06 488437,47 2629219,87
avg-cpu: %user %nice %system %iowait %steal %idle
2,72 0,00 0,74 0,00 0,00 96,53
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await svctm %util
sda 0,00 0,00 0,00 0,00 0,00 0,00
0,00 0,00 0,00 0,00 100,00
sdb 0,00 0,00 0,00 0,00 0,00 0,00
0,00 0,00 0,00 0,00 100,00
avg-cpu: %user %nice %system %iowait %steal %idle
6,68 0,00 0,99 0,00 0,00 92,33
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await svctm %util
sda 0,00 0,00 0,00 0,00 0,00 0,00
0,00 0,00 0,00 0,00 100,00
sdb 0,00 0,00 0,00 0,00 0,00 0,00
0,00 0,00 0,00 0,00 100,00
avg-cpu: %user %nice %system %iowait %steal %idle
4,40 0,00 0,73 1,47 0,00 93,40
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s
avgrq-sz avgqu-sz await svctm %util
sda 0,00 0,00 0,00 0,00 0,00 0,00
0,00 0,00 0,00 0,00 100,00
sdb 0,00 4,00 0,00 3,00 0,00 28,00
18,67 0,06 19,50 333,33 100,00
Global values for service time and utilization are garbage. For
interval values, utilization is always 100%, and service time is
higher than normal.
I bisected it down to:
[a9327cac440be4d8333bba975cbbf76045096275] Seperate read and write
statistics of in_flight requests
and verified that reverting just that commit indeed solves the issue
on 2.6.32-rc1.
My sysstat package is:
[corrado@et2 linux-2.6]$ rpm -qi sysstat
Name : sysstat Relocations: (not relocatable)
Version : 9.0.1 Vendor: Mandriva
Release : 1mdv2009.1 Build Date: mer 11 mar
2009 20:50:16 CET
Install Date: lun 27 lug 2009 21:25:13 CEST Build Host: n2.mandriva.com
Group : System/Configuration/Other Source RPM:
sysstat-9.0.1-1mdv2009.1.src.rpm
Size : 681881 License: GPL
Signature : DSA/SHA1, gio 23 apr 2009 20:40:00 CEST, Key ID 445935f878d019f5
Packager : Frederik Himpe <fhimpe@mandriva.org>
URL : http://perso.wanadoo.fr/sebastien.godard
Summary : Includes the sar and iostat system monitoring commands
Description :
This package provides the sar and iostat commands for the Linux
operating system, similar to their traditional UNIX counterparts.
They enable system monitoring of disk, network, and other IO activity.
Thanks,
Corrado
--
__________________________________________________________________________
dott. Corrado Zoccolo mailto:czoccolo@gmail.com
PhD - Department of Computer Science - University of Pisa, Italy
--------------------------------------------------------------------------
next reply other threads:[~2009-10-04 10:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-04 10:49 Corrado Zoccolo [this message]
2009-10-04 19:06 ` Jens Axboe
2009-10-06 13:14 ` Nikanth Karthikesan
2009-10-06 13:16 ` [PATCH linux-2.6-block#for-linus] Seperate read and write statistics of in_flight requests v2 Nikanth Karthikesan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4e5e476b0910040349l21b69a97o7a11b2138bc8f573@mail.gmail.com \
--to=czoccolo@gmail.com \
--cc=jens.axboe@oracle.com \
--cc=knikanth@suse.de \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome