Date: Fri, 14 Jun 2002 14:32:10 +0200 (CEST) From: Tomek Dudziak <loco@piecyk.allegro.pl> To: freebsd-questions@freebsd.org Subject: Web server load avereage peaks Message-ID: <Pine.LNX.4.43.0206141411530.9467-100000@piecyk.allegro.pl>
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Hi,
I'm having trouble with finding out what causes load average to suddenly
peak on our web server. The machine is a quad Xeon 500 Compaq with 4G
RAM, serving php/static pages. 10-13Mbit/s outgoing traffic.
Normally, load is as shown below, but from time to time the machine feels
really slow - when logged on, commands like ls or top display slowly line
by line. Load average jumps even up to 350.
The problem is that 'top' doesn't show any unusual activity - none of the
apache processes are eating more resources than normally. However more
apaches start, which I think is the result and not the cause for system
slowdown. netstat -m looks ok.
Below are two screenshots of systat - first one during normal load and
second during peak. As I don't understand all of it - maybe someone else
could help diagnose the problem.
Thanks,
Tomek
Normal
++++++++++++++++++++
7 users Load 4.37 5.81 12.02 Pi=B1 14 Cze 13:55
Mem:KB REAL VIRTUAL VN PAGER SWAP PAGER
Tot Share Tot Share Free in out in out
Act 174516 3240 254368 3844 635464 count
All 3367744 6344 4093828 12364 pages
781 zfod Interrupts
Proc:r p d s w Csw Trp Sys Int Sof Flt 282 cow 3470 total
72 2 63 3692 176729079 3470 507 1310 332060 wire 2729 xl0 i=
rq2
216032 act 513 sym0 =
irq5
43.6%Sys 2.8%Intr 22.7%User 4.6%Nice 26.3%Idl 2775316 inact sym1 =
irq9
| | | | | | | | | | 44336 cache ata0 =
irq14
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D+>>>>>>>>=
>>>>-- 591128 free fdc0 irq6
daefr atkbd=
0 irq
Namei Name-cache Dir-cache 528 prcfr 100 clk i=
rq0
Calls hits % hits % react 128 rtc i=
rq8
66817 66611 100 11 0 pdwake
pdpgs
Disks da0 da1 da2 da3 acd0 fd0 pass0 intrn
KB/t 6.95 3.78 5.99 5.85 0.00 0.00 0.00 204096 buf
tps 3 13 12 471 0 0 0 2983 dirtybuf
MB/s 0.02 0.05 0.07 2.69 0.00 0.00 0.00 255641 desiredvnodes
% busy 2 7 7 100 0 0 0 240536 numvnodes
10463 freevnodes
Peak
++++++++++++++++++++
6 users Load124.92 46.36 24.43 Pi=B1 14 Cze 13:27
Mem:KB REAL VIRTUAL VN PAGER SWAP PAGER
Tot Share Tot Share Free in out in out
Act 363836 8380 595516 9700 473732 count
All 3528972 12084 203604 21720 pages
1148 zfod Interrupts
Proc:r p d s w Csw Trp Sys Int Sof Flt 137 cow 2783 total
303 9 82 18298 180920570 2809 556 1411 336676 wire 2525 xl0 i=
rq2
397412 act 31 sym0 =
irq5
71.3%Sys 2.5%Intr 26.2%User 0.0%Nice 0.0%Idl 2751052 inact sym1 =
irq9
| | | | | | | | | | 43832 cache ata0 =
irq14
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D+>>>>>>>>>>> 429900 free fdc0 irq=
6
daefr atkbd=
0 irq
Namei Name-cache Dir-cache 498 prcfr 100 clk i=
rq0
Calls hits % hits % react 127 rtc i=
rq8
30328 30182 100 7 0 pdwake
pdpgs
Disks da0 da1 da2 da3 acd0 fd0 pass0 intrn
KB/t 20.16 43.67 3.90 6.00 0.00 0.00 0.00 204096 buf
tps 3 0 27 0 0 0 0 360 dirtybuf
MB/s 0.06 0.02 0.10 0.00 0.00 0.00 0.00 255641 desiredvnodes
% busy 3 0 13 0 0 0 0 240536 numvnodes
10479 freevnodes
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