Date: Mon, 4 Jul 2011 20:16:19 +0300 From: "Adrian Minta" <gygy@stsnet.ro> To: freebsd-net@freebsd.org Subject: Re: FreeBSD 8.2 and MPD5 stability issues - update Message-ID: <813678a855c90c49bf66c7084f88b45d.squirrel@mail.stsnet.ro>
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>It seems, enough. But, are you sure your L2TP client will wait
>for overloaded daemon to complete connection? The change will
>proportionally increase responsiveness of mpd - it has not enough CPU
>horsepower to process requests timely.
>
>Eugene Grosbein
Actually something else is happening.
I increased the queue in msg.c
#define MSG_QUEUE_LEN 65536
... and in the ppp.h:
#define SETOVERLOAD(q) do { \
int t = (q); \
if (t > 600) { \
gOverload = 100; \
} else if (t > 100) { \
gOverload = (t - 100) * 2; \
} else { \
gOverload = 0; \
} \
} while (0)
Now the overload message is very rare, but the behaviour is the same.
Around 5500 sessions the number don't grow anymore, but instead begin to
decrease.
The mpd log say something like this:
#tail -f /var/log/mpd.log | grep -v "\["
Jul 4 19:56:46 lns mpd: Incoming L2TP packet from 10.42.10.16 1701
Jul 4 19:56:46 lns mpd: L2TP: Incoming call #32 via connection
0x80ae96c10 received
Jul 4 19:56:46 lns mpd: Link: packet from unexisting link "6310"
Jul 4 19:56:46 lns mpd: Link: packet from unexisting link "6251"
Jul 4 19:56:46 lns mpd: Link: packet from unexisting link "6250"
Jul 4 19:56:46 lns mpd: L2TP: Control connection 0x80b06b710 10.42.1.48
1701 <-> 10.42.9.210 1701 connected
Jul 4 19:56:46 lns mpd: Incoming L2TP packet from 10.42.10.4 1701
Jul 4 19:56:46 lns mpd: Incoming L2TP packet from 10.42.10.10 1701
Jul 4 19:56:46 lns mpd: L2TP: Incoming call #48 via connection
0x80b06b710 received
Jul 4 19:56:46 lns mpd: Link: packet from unexisting link "6311"
Jul 4 19:56:46 lns mpd: Link: packet from unexisting link "6312"
Jul 4 19:56:46 lns mpd: Link: packet from unexisting link "6252"
Jul 4 19:56:46 lns mpd: L2TP: Control connection 0x80ad99110 10.42.1.23
1701 <-> 10.42.9.244 1701 connected
Jul 4 19:56:46 lns mpd: L2TP: Control connection 0x80ad99410 10.42.1.4
1701 <-> 10.42.10.16 1701 connected
Jul 4 19:56:46 lns mpd: Incoming L2TP packet from 10.42.9.234 1701
Jul 4 19:56:46 lns mpd: Incoming L2TP packet from 10.42.10.2 1701
Jul 4 19:56:47 lns mpd: L2TP: Incoming call #4 via connection 0x80ad99410
received
Jul 4 19:56:47 lns mpd: L2TP: Incoming call #23 via connection
0x80ad99110 received
Jul 4 19:56:47 lns mpd: Link: packet from unexisting link "6253"
Jul 4 19:56:47 lns mpd: L2TP: Control connection 0x80ad99a10 10.42.1.7
1701 <-> 10.42.10.4 1701 connected
Jul 4 19:56:47 lns mpd: Incoming L2TP packet from 10.42.9.214 1701
Jul 4 19:56:47 lns mpd: Incoming L2TP packet from 10.42.9.220 1701
Jul 4 19:56:47 lns mpd: L2TP: Incoming call #7 via connection 0x80ad99a10
received
Jul 4 19:56:47 lns mpd: L2TP: Control connection 0x80ad99d10 10.42.1.7
1701 <-> 10.42.10.10 1701 connected
Jul 4 19:56:47 lns mpd: Link: packet from unexisting link "6254"
Jul 4 19:56:47 lns mpd: Link: packet from unexisting link "6303"
Jul 4 19:56:47 lns mpd: Link: packet from unexisting link "6302"
Jul 4 19:56:47 lns mpd: L2TP: Control connection 0x80ab22b10 10.42.1.32
1701 <-> 10.42.9.234 1701 connected
Jul 4 19:56:47 lns mpd: L2TP: Control connection 0x80ab22810 10.42.1.13
1701 <-> 10.42.10.2 1701 connected
Jul 4 19:56:47 lns mpd: Incoming L2TP packet from 10.42.10.14 1701
A top command reveal that the server is around 50% free:
last pid: 63542; load averages: 4.93, 2.98, 1.40 up 0+22:32:42 19:44:23
24 processes: 2 running, 22 sleeping
CPU 0: 4.5% user, 0.0% nice, 5.6% system, 36.8% interrupt, 53.0% idle
CPU 1: 2.6% user, 0.0% nice, 7.5% system, 48.5% interrupt, 41.4% idle
CPU 2: 3.7% user, 0.0% nice, 7.9% system, 32.6% interrupt, 55.8% idle
CPU 3: 3.0% user, 0.0% nice, 7.9% system, 33.5% interrupt, 55.6% idle
CPU 4: 5.6% user, 0.0% nice, 13.9% system, 33.8% interrupt, 46.6% idle
CPU 5: 2.3% user, 0.0% nice, 7.5% system, 36.1% interrupt, 54.1% idle
CPU 6: 3.0% user, 0.0% nice, 9.8% system, 36.1% interrupt, 51.1% idle
CPU 7: 0.8% user, 0.0% nice, 2.6% system, 43.2% interrupt, 53.4% idle
Mem: 148M Active, 695M Inact, 753M Wired, 108K Cache, 417M Buf, 2342M Free
Swap: 4096M Total, 4096M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
75502 root 2 76 0 194M 168M select 4 4:32 63.57% mpd5
2131 root 1 46 0 7036K 1544K select 1 4:27 5.18% syslogd
1914 root 1 44 0 5248K 3176K select 2 0:17 0.00% devd
73229 root 1 44 0 16384K 8464K wait 1 0:02 0.00% bash
2434 root 1 44 0 12144K 4156K select 2 0:01 0.00% sendmail
73222 media 1 44 0 28500K 4360K select 6 0:00 0.00% sshd
2445 root 1 76 0 7964K 1624K nanslp 0 0:00 0.00% cron
1861 root 1 44 0 8060K 1372K select 0 0:00 0.00% moused
73219 root 1 44 0 28500K 4284K sbwait 4 0:00 0.00% sshd
2438 smmsp 1 44 0 12144K 3952K pause 1 0:00 0.00% sendmail
73225 root 1 45 0 10300K 2756K pause 5 0:00 0.00% csh
73224 media 1 44 0 21680K 2024K wait 0 0:00 0.00% su
2419 root 1 44 0 16532K 3768K select 0 0:00 0.00% sshd
2538 root 1 76 0 6904K 1284K ttyin 3 0:00 0.00% getty
2536 root 1 76 0 6904K 1284K ttyin 1 0:00 0.00% getty
2539 root 1 76 0 6904K 1284K ttyin 2 0:00 0.00% getty
63542 root 1 44 0 9368K 2444K CPU0 0 0:00 0.00% top
2533 root 1 76 0 6904K 1284K ttyin 0 0:00 0.00% getty
2537 root 1 76 0 6904K 1284K ttyin 6 0:00 0.00% getty
73223 media 1 45 0 8336K 1900K wait 4 0:00 0.00% sh
2535 root 1 76 0 6904K 1284K ttyin 5 0:00 0.00% getty
2540 root 1 76 0 6904K 1284K ttyin 7 0:00 0.00% getty
2534 root 1 76 0 6904K 1284K ttyin 4 0:00 0.00% getty
The incoming calls rate is around 30/sec. If I lower this to 10/sec I'm
able to achieve 7000 sessions.
--
Best regards
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