Date: Tue, 3 Apr 2007 12:39:41 +0545 From: Tek Bahadur Limbu <teklimbu@wlink.com.np> To: "Alessandro" <garcol@postino.it> Cc: freebsd-performance@freebsd.org Subject: Re: FreeBSD-6.1 reboots due to high mbufs Message-ID: <20070403123941.80d9a3e9.teklimbu@wlink.com.np> In-Reply-To: <000c01c774f3$0ac90690$05010b0a@elitel> References: <000c01c774f3$0ac90690$05010b0a@elitel>
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On Mon, 2 Apr 2007 08:49:17 +0200
"Alessandro" <garcol@postino.it> wrote:
> Hi,
>
> I think the tcp connections remain in ESTABLISHED for a long time, it can depend from satellite link (high delay) or a problem with TCP timing in 6.1. (The hardware configurations is the same of 4.x box?)
The hardware configurations are different boxes. Hardware running 4.x
are assembled Pentium 4 PCs having 1 GB Ram.
Hardware running 6.x are more powerful Dell 420/430 servers!
>
> First of all you can try to set:
> sysctl net.inet.tcp.inflight.enable=0
> and then:
> sysctl net.isr.direct=0
> sysctl net.inet.tcp.slowstart_flightsize=4 or more
I have set the above sysctl values as according but will have to wait
for another 24 hours before reporting.
>
>
> Can you upgrade FreeBSD?
Well since this is a production server, I'm afraid that it might not be
a possible option to upgrade to 6.2.
> Can you run a "systat -vm 1" and "top"?
Output: systat -vm 1:
1 users Load 0.08 0.13 0.09 Apr 3 12:31
Mem:KB REAL VIRTUAL VN PAGER SWAP PAGER
Tot Share Tot Share Free in out in out
Act 353440 7068 377324 13080 97488 count
All 1874660 7396 82692924 13636 pages
Interrupts
Proc:r p d s w Csw Trp Sys Int Sof Flt cow 5903 total
3 27 1 7711 67513149 4269 44 166792 wire 14: ata
353216 act 1770 17: bge
3.0%Sys 2.2%Intr 0.4%User 0.0%Nice 94.4%Idl 1270252 inact 118 20: ata
| | | | | | | | | | 87400 cache 2004 cpu0: time
=++ 10088 free 2011 cpu1: time
daefr
Namei Name-cache Dir-cache prcfr
Calls hits % hits % react
60 46 77 pdwake
zfod pdpgs
Disks ad4 ozfod intrn
KB/t 16.07 %slo-z 218432 buf
tps 117 35 tfree 380 dirtybuf
MB/s 1.84 100000 desiredvnodes
% busy 16 59061 numvnodes
20049 freevnodes
Output: Top:
last pid: 30668; load averages: 0.09, 0.13, 0.09 up 0+17:07:43 12:32:33
32 processes: 1 running, 30 sleeping, 1 lock
CPU states: 1.3% user, 0.0% nice, 0.9% system, 2.1% interrupt, 95.7% idle
Mem: 345M Active, 1241M Inact, 163M Wired, 85M Cache, 213M Buf, 8716K Free
Swap: 4096M Total, 4096M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
625 squid 1 96 0 319M 314M *Giant 0 19:46 4.59% squid
8171 root 1 96 0 28268K 11368K select 0 0:42 0.00% snmpd
685 squid 1 -4 0 5160K 1248K msgwai 0 0:34 0.00% diskd-daemon
686 squid 1 -4 0 5160K 1236K msgwai 0 0:31 0.00% diskd-daemon
28155 bind 1 96 0 12164K 8544K select 0 0:10 0.00% named
406 root 1 96 0 3540K 1008K select 0 0:02 0.00% syslogd
1117 tek 1 96 0 29932K 3424K select 0 0:01 0.00% sshd
1271 root 1 8 0 7812K 2152K wait 1 0:00 0.00% bash
614 root 1 8 0 3560K 1092K nanslp 0 0:00 0.00% cron
6766 root 1 8 0 7776K 2104K wait 0 0:00 0.00% bash
584 root 1 96 0 2420K 836K select 0 0:00 0.00% usbd
485 root 1 96 0 4636K 1080K select 0 0:00 0.00% rpcbind
1114 root 1 4 0 29364K 2860K sbwait 0 0:00 0.00% sshd
1118 tek 1 8 0 7756K 2064K wait 0 0:00 0.00% bash
1268 root 1 20 0 9176K 2492K pause 0 0:00 0.00% csh
6763 root 1 20 0 9220K 2540K pause 1 0:00 0.00% csh
684 squid 1 -8 0 2376K 684K piperd 0 0:00 0.00% unlinkd
> If you run netstat -in no errors are report?
root@server# netstat -in
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
bge0 1500 <Link#1> 00:15:73:27:e8:07 28138850 0 26560747 0 0
bge0 1500 202.xx.xx 202.xx.xx.xx 16381694 - 26516294 - -
bge0 1500 202.xxx.xxx.x 202.xxx.xxx.xx 2 - 43071 - -
lo0 16384 <Link#2> 147155 0 147155 0 0
lo0 16384 127 127.0.0.1 147155 - 147155 - -
>
> If there are a lot of connections a lot of nmbclusters are used, you can run
> "netstat -na | grep ESTAB | wc -l".
3 CLOSE_WAIT
16 CLOSING
1498 ESTABLISHED
547 FIN_WAIT_1
571 FIN_WAIT_2
17 LAST_ACK
6 LISTEN
56 SYN_SENT
241 TIME_WAIT
1 been
> The number of nmbcluster used is related with the number of connections.
Yes, I understand the relation between nmbcluters and the no. of connections.
Thanks alot for your feedback and suggestions.
>
> Let me know.
> Regards
> Alessandro
> _______________________________________________
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>
- --
With best regards and good wishes,
Yours sincerely,
Tek Bahadur Limbu
(TAG/TDG Group)
Jwl Systems Department
Worldlink Communications Pvt. Ltd.
Jawalakhel, Nepal
http://www.wlink.com.np
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