Date: Wed, 14 Sep 2005 22:11:47 +0200 (MEST) From: "Mariano Benedettini" <diodex@gmx.net> To: freebsd-stable@freebsd.org Subject: High load averages on a 5.3-RELEASE Message-ID: <32422.1126728707@www84.gmx.net>
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Hi people, I've also posted this message to freebsd-performance, with no
answer.
I have a mail server running FreeBSD 5.3-RELEASE. It's a dual Xeon with 4gb
of ram.
The server is running Apache (serving Horde) , Postfix, Courier imapd w/SSL,
Amavisd. Also a Postgresql as Horde's storage.
The mail storage is accessed via NFS (this server is the nfs client).
The problem is that it's experiencing a really high load average (see the
top -S and vmstat -systat ) while the CPU's are relatively idle. I think
it's a IO problem
(nfs?), but I cant figure out what exactly is causing this.
last pid: 96776; load averages: 13.60, 13.94, 18.26 up
22+01:45:44 17:08:08
1166 processes:8 running, 1087 sleeping, 71 waiting
CPU states: 12.3% user, 0.0% nice, 17.8% system, 2.1% interrupt, 67.8%
idle
Mem: 1637M Active, 1638M Inact, 320M Wired, 192M Cache, 112M Buf, 28M Free
Swap: 2023M Total, 216K Used, 2023M Free
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU
COMMAND
11 root 132 0 0K 12K RUN 3 492.1H 82.13% 82.13%
idle: cpu3
14 root 132 0 0K 12K RUN 0 487.0H 79.83% 79.83%
idle: cpu0
12 root 132 0 0K 12K RUN 2 487.0H 78.37% 78.37%
idle: cpu2
13 root 132 0 0K 12K CPU1 1 463.9H 71.63% 71.63%
idle: cpu1
24 root -64 -183 0K 12K CPU0 0 154:50 2.29% 2.29%
irq11: ohci0
79636 www 4 0 33532K 22264K sbwait 2 0:08 1.27% 1.27%
httpd
78 root -44 -163 0K 12K WAIT 1 371:20 1.12% 1.12%
swi1: net
95810 root 5 0 1844K 1432K ttyin 1 0:03 1.03% 1.03%
systat
59508 root 5 0 1836K 1336K ttyin 3 5:56 0.98% 0.98%
systat
79 root -28 -147 0K 12K WAIT 1 171:24 0.93% 0.93%
swi5: clock sio
72854 www 96 0 34068K 22800K select 1 0:11 0.93% 0.93%
httpd
90730 www 20 0 29720K 18452K lockf 0 0:02 0.93% 0.93%
httpd
77968 www 4 0 36816K 25556K sbwait 2 0:09 0.88% 0.88%
httpd
78081 www 20 0 31916K 20640K lockf 1 0:07 0.83% 0.83%
httpd
96143 postfix 96 0 3180K 2284K select 1 0:02 0.78% 0.78%
smtpd
70626 www 20 0 33264K 21992K lockf 3 0:08 0.73% 0.73%
httpd
71231 root 96 0 2572K 1696K select 1 0:03 0.68% 0.68%
couriertls
87567 www 4 0 33276K 22040K sbwait 3 0:04 0.63% 0.63%
httpd
78109 www 20 0 34228K 22968K lockf 1 0:08 0.49% 0.49%
httpd
71240 mfx 96 0 2596K 1532K select 0 0:02 0.49% 0.49%
imapd
95217 vscan 20 0 20068K 18088K lockf 3 0:01 0.49% 0.49%
perl
79635 www 20 0 34160K 22884K lockf 3 0:05 0.44% 0.44%
httpd
75988 pgsql 4 0 20436K 14468K sbwait 2 0:02 0.44% 0.44%
postgres
96754 postfix 4 0 3180K 2284K select 2 0:00 4.61% 0.44%
smtpd
79861 pgsql 4 0 20436K 14332K sbwait 0 0:01 0.39% 0.39%
postgres
90802 www 20 0 33272K 22032K lockf 1 0:03 0.34% 0.34%
httpd
96763 postfix 4 0 3160K 2272K select 0 0:00 7.00% 0.34%
smtpd
96756 postfix 4 0 3088K 2204K select 3 0:00 3.08% 0.29%
smtp
85422 www 20 0 34168K 22892K lockf 3 0:04 0.24% 0.24%
httpd
90750 www 4 0 33284K 22024K sbwait 1 0:02 0.24% 0.24%
httpd
5 users Load 11.65 13.51 18.06 14 sep 17:08
(this is ugly, sorry):
Mem:KB REAL VIRTUAL VN PAGER SWAP PAGER
Tot Share Tot Share Free in out in out
Act 1624872 13936 3218536 27392 226332 count
All 3864628 39728 2312968 378336 pages
Interrupts
Proc:r p d s w Csw Trp Sys Int Sof Flt 162 cow 1138 total
1 3 1k 5797 599 6050 1793 133 688 326888 wire 1:
atkb
1673300 act 6:
fdc0
6.1%Sys 2.2%Intr 8.7%User 0.0%Nice 83.0%Idl 1681452 inact 128 8: rtc
| | | | | | | | | | 196908 cache 166 11:
ohc
===+>>>>> 29424 free 13:
npx
daefr 14:
ata
Namei Name-cache Dir-cache 384 prcfr 18 15:
ata
Calls hits % hits % react 18 16:
cis
27907 27560 99 pdwak 541 26:
bge
252 zfod pdpgs 167 29:
bge
Disks da0 pass0 248 ofod intrn 30:
ahc
KB/t 13.57 0.00 98 %slo-z 114464 buf 31:
ahc
tps 18 0 645 tfree 178 dirty 100 0: clk
MB/s 0.24 0.00 100000 desiredvnodes
% busy 6 0 91116 numvnodes
46875 freevnodes
After searching lists and documentation, I'm not sure what's
causing the problem.
Suggestions ?
Thanks in advance,
Mariano.
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