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Subject[bisected] commit: a9327cac440be4d8333bba975cbbf76045096275 causes iostat output
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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
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