Date: Sat, 24 Jun 2006 14:57:27 -0300 (ADT) From: "Marc G. Fournier" <scrappy@hub.org> To: Kostik Belousov <kostikbel@gmail.com> Cc: freebsd-stable@freebsd.org, Dmitry Morozovsky <marck@rinet.ru> Subject: Re: vmstat 'b' (disk busy?) field keeps climbing ... Message-ID: <20060624145432.A1114@ganymede.hub.org> In-Reply-To: <20060624090656.GB79678@deviant.kiev.zoral.com.ua> References: <20060623172557.H1114@ganymede.hub.org> <261AD16B-C3FE-4671-996E-563053508CE8@mac.com> <20060624022227.X1114@ganymede.hub.org> <20060624115505.E14669@woozle.rinet.ru> <20060624090656.GB79678@deviant.kiev.zoral.com.ua>
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On Sat, 24 Jun 2006, Kostik Belousov wrote:
> On Sat, Jun 24, 2006 at 11:55:26AM +0400, Dmitry Morozovsky wrote:
>> On Sat, 24 Jun 2006, Marc G. Fournier wrote:
>>
>> MGF> > 'b' stands for "blocked", not "busy". Judging by your page fault rate
>> MGF> > and the high number of frees and pages being scanned, you're probably
>> MGF> > swapping tasks in and out and are waiting on disk. Take a look at
>> MGF> > "vmstat -s", and consider adding more RAM if this is correct...
>> MGF>
>> MGF> is there a way of finding out what processes are blocked?
>>
>> Aren't they in 'D' status by ps?
> Use ps axlww. In this way, at least actual blocking points are shown.
'k, stupid question then ... what am I searching for?
# ps axlww | awk '{print $9}' | sort | uniq -c | sort -nr
654 select
230 lockf
166 wait
85 -
80 piperd
71 nanslp
33 kserel
22 user
10 pause
9 ttyin
5 sbwait
3 psleep
3 accept
2 kqread
2 Giant
1 vlruwt
1 syncer
1 sdflus
1 ppwait
1 ktrace
1 MWCHAN
According to vmstat, I'm holding at '4 blocked' for the most part ...
sbwwait is socket related, not disk ... and none of the others look right
...
---- Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
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