Date: Fri, 23 Jun 2006 19:12:54 -0300 (ADT) From: "Marc G. Fournier" <scrappy@hub.org> To: Charles Swiger <cswiger@mac.com> Cc: freebsd-stable@freebsd.org Subject: Re: vmstat 'b' (disk busy?) field keeps climbing ... Message-ID: <20060623191131.C1114@ganymede.hub.org> In-Reply-To: <261AD16B-C3FE-4671-996E-563053508CE8@mac.com> References: <20060623172557.H1114@ganymede.hub.org> <261AD16B-C3FE-4671-996E-563053508CE8@mac.com>
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On Fri, 23 Jun 2006, Charles Swiger wrote:
> On Jun 23, 2006, at 4:44 PM, Marc G. Fournier wrote:
>> procs memory page disks faults cpu
>> r b w avm fre flt re pi po fr sr da0 pa0 in sy cs us sy
>> id
>> 1 42 1 10249060 161668 1290 54 12 3 1409 2202 102 0 751 6416 3350 24
>> 15 61
>> 0 39 0 10148976 148104 654 10 5 2 660 0 49 0 615 4440 2584 18
>> 9 73
>>
>> the last time it hung, it hit about 45 ... about 6 hours ago, it was at
>> ~5-10 ... anything I should look at to figure out where those 39+ are
>> 'busy'?
>
> 'b' stands for "blocked", not "busy". Judging by your page fault rate and
> the high number of frees and pages being scanned, you're probably swapping
> tasks in and out and are waiting on disk. Take a look at "vmstat -s", and
> consider adding more RAM if this is correct...
'k, I will keep an eye on things and check vmstat -s as those numbers grow
higher ... thanks for hte clarification on 'blocked' vs 'busy' :(
What specifically should I be looking at in vmstat -s? note that the
server just rebooted, 0 swap is used:
# pstat -s
Device 1K-blocks Used Avail Capacity
/dev/da0s1b 8388608 0 8388608 0%
and vmstat -s is showing:
# vmstat -s
8434656 cpu context switches
2554513 device interrupts
430486 software interrupts
4353484 traps
21299255 system calls
36 kernel threads created
28399 fork() calls
1708 vfork() calls
0 rfork() calls
0 swap pager pageins
0 swap pager pages paged in
0 swap pager pageouts
0 swap pager pages paged out
31750 vnode pager pageins
209538 vnode pager pages paged in
15954 vnode pager pageouts
219494 vnode pager pages paged out
20 page daemon wakeups
648514 pages examined by the page daemon
16508 pages reactivated
1014412 copy-on-write faults
5389 copy-on-write optimized faults
1982109 zero fill pages zeroed
1070481 zero fill pages prezeroed
1626 intransit blocking page faults
3786729 total VM faults taken
0 pages affected by kernel thread creation
2344822 pages affected by fork()
299231 pages affected by vfork()
0 pages affected by rfork()
3360377 pages freed
0 pages freed by daemon
1672560 pages freed by exiting processes
618892 pages active
275063 pages inactive
42967 pages in VM cache
66898 pages wired down
6398 pages free
4096 bytes per page
36972009 total name lookups
cache hits (97% pos + 0% neg) system 0% per-directory
deletions 0%, falsehits 0%, toolong 0%
thx ...
----
Marc G. Fournier Hub.Org Networking Services (http://www.hub.org)
Email . scrappy@hub.org MSN . scrappy@hub.org
Yahoo . yscrappy Skype: hub.org ICQ . 7615664
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