Date: Fri, 27 Sep 2013 23:12:08 GMT From: Olivier Cochard-Labbe <olivier@cochard.me> To: freebsd-gnats-submit@FreeBSD.org Subject: bin/182448: systat -if have invalid counters with 10Gb/s traffic Message-ID: <201309272312.r8RNC8fA066176@oldred.freebsd.org> Resent-Message-ID: <201309272320.r8RNK0aK013504@freefall.freebsd.org>
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>Number: 182448
>Category: bin
>Synopsis: systat -if have invalid counters with 10Gb/s traffic
>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: Fri Sep 27 23:20:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator: Olivier Cochard-Labbe
>Release: 9.2-RC4
>Organization:
BSD Router Project
>Environment:
FreeBSD bsdrp2.orange.bsdrp.net 9.2-RC4 FreeBSD 9.2-RC4 #0 r255473M: Fri Sep 20 23:47:45 CEST 2013 root@orange.bsdrp.net:/usr/obj/BSDRP.amd64/usr/local/BSDRP/BSDRP/FreeBSD/src/sys/amd64 amd64
>Description:
During a 10Gb/s network load test I found that systat didn't display good values with the default 5 seconds refresh (but it's fixed with less than 5 seconds refresh).
Here is an example with "systat -ifstat" + ":scale gbit" :
/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10
Load Average |||
Interface Traffic Peak Total
ix0 in 2.964 Gb/s 2.964 Gb/s 143.442 TB
out 0.000 Gb/s 0.000 Gb/s 0.566 KB
During the same network load, now with a 1 seconds refresh: "systat -ifstat 1" + ":scale mbit" :
"systat -ifstat" + ":scale mbit" :
/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10
Load Average |||
Interface Traffic Peak Total
ix0 in 9.827 Gb/s 9.830 Gb/s 143.396 TB
out 0.000 Gb/s 0.000 Gb/s 0.566 KB
=> Notice that the bar "Load Average" didn't change with the new refresh time.
>How-To-Repeat:
just start "systat -ifstat" under high usage of 10Gb/s NIC
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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