Date: Tue, 14 Jul 2009 16:08:09 GMT From: Vladimir Krasovsky <vovets@gmail.com> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/136759: iostat displays wrong I/O statistics with -c 1 Message-ID: <200907141608.n6EG89l8006249@www.freebsd.org> Resent-Message-ID: <200907141610.n6EGA0TV040231@freefall.freebsd.org>
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>Number: 136759
>Category: misc
>Synopsis: iostat displays wrong I/O statistics with -c 1
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jul 14 16:10:00 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator: Vladimir Krasovsky
>Release: 7.0
>Organization:
yandex.ru
>Environment:
FreeBSD host 7.0-STABLE FreeBSD 7.0-STABLE #1: Fri Feb 29 14:05:58 MSK 2008 root@host:/opt/obj/opt/src/sys/W5L_AMD64_ULE amd64
>Description:
First line of iostat output always displays arbitrary (and wrong) numbers.
user@host:~$ for i in 1 2 3 4; do iostat -c $i -d da2; done
da2
KB/t tps MB/s
6.31 64 0.40
da2
KB/t tps MB/s
6.31 64 0.40
12.64 53 0.65
da2
KB/t tps MB/s
6.31 64 0.40
6.67 27 0.18
2.00 23 0.04
da2
KB/t tps MB/s
6.31 64 0.40
2.00 23 0.04
3.27 11 0.04
7.25 16 0.11
As you can see the first line is always the same. Though on different machines at different loads it may differ.
>How-To-Repeat:
for i in 1 2 3 4; do iostat -c $i -d da2; done
>Fix:
Use -c 2 or more.
>Release-Note:
>Audit-Trail:
>Unformatted:
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