Re: ipv4 connection problems
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On Mon, Mar 14, 2005 at 11:35:54PM -0800, Matthew Dillon wrote:
>=20
> :Right after I had a hung telnet:
> :
> :box:~% sysctl net.inet.ip.portrange
> :net.inet.ip.portrange.lowfirst: 1023
> :net.inet.ip.portrange.lowlast: 600
> :net.inet.ip.portrange.first: 1024
> :net.inet.ip.portrange.last: 5000
> :net.inet.ip.portrange.hifirst: 49152
> :net.inet.ip.portrange.hilast: 65535
> :box:~% sysctl kern.ipc.maxsockets
> :kern.ipc.maxsockets: 12328
> :box:~% netstat -tn | wc -l
> : 229
> :box:~% netstat -tn | fgrep TIME_WAIT | wc -l
> : 25
> :box:~% netstat -m
> :1024/2278/26624 mbufs in use (current/peak/max):
> : 1024 mbufs allocated to data
> :920/1306/6656 mbuf clusters in use (current/peak/max)
> :3181 Kbytes allocated to network (15% of mb_map in use)
> :0 requests for memory denied
> :0 requests for memory delayed
> :0 calls to protocol drain routines
> :
> :
> :Peter
>=20
> It does not appear to be hitting any limits. Check your 'dmesg' outp=
ut,
> are you getting a packet rate warnings? In particular RST rate=20
> warnings?
=20
No.
> Also check your apache configuration... how many simultanious connect=
ions
> is it configured to handle? You have ~229-25 active connections and
> I think by default Apache only handles 150. I don't know what
> percentage of those connections are to port 80 and what are to other
> ports, but it's definitely a possible suspect.
=20
Only 42 of those are http connections. Definitely not hitting an Apache li=
mit
there. Keep in mind too, I've been able to duplicate this behavior with ftp
and smtp.
> If it isn't an apache configuration issue then all I can think of is
> to ctl-alt-esc and panic the machine while telnet is in this state an=
d=20
> get the vmcore and kernel to us, we might be able to figure out what
> is going on post-mortem.
=20
This will be tricky since I'm about 7100 miles from the machine right now,
but if I can arrange it, I'll do it.
--Peter
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