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Re: TCP Packets get lost under moderate network load [message #34651 is a reply to message #34649]

Fri, 23 January 2009 13:52

klathor
Messages: 3
Registered: January 2009

Junior Member

Quote:

-Out of desperation I turned off iptables entirely (no rules, no modules loaded)
on both the HN & VPS, which appeared to clear up everything.
-The issue reappears with iptables turned ON on the HN but turned OFF on the VPS
(IPTABLES="" in /etc/vz/vz.conf).

Sorry, I didn't catch you. Why doesn't this mean that the problem is because of the iptables rules on the HN?

Actually that's a good question... I assumed the rules were ok since they're pretty simple and the problems aren't constant. I will try another test with just the modules loaded and no rules.

Quote:

tcpdump (same thing seen on HN and VPS)

Are you sure that we get exactly the same output inside VPS?

I haven't done dumps simultaneously on the HN and VPS, but I do see the same behavior either way (syn+ack sent multiple times, responding ack ignored). I can do dumps simultaneously if you wish.

Quote:

Is there anything in logs or in dmesg?

The only thing I see are the infamous "Orphaned socket dropped" messages in dmesg. They start about 2-3 mins after the SYN_RECV states start to pile up and repeat a lot.

Quote:

could you please attach the full output of /proc/user_beancounters?
And please attach the output of the following files:

- /proc/net/netstat
- /proc/net/softnet_stat
- /proc/net/snmp
- /proc/net/sockstat

but not as is. Could you please collect information in the dynamics i.e. when a problem appears collect information to obtain what changes and what kind of errors increase.

P.S. You'd better attach the requested information to your bug report instead of attaching here.

Will do. Unfortunately I'm out of the office till Monday but I'll get to it asap.

Thank you very much for the help.
-JayKim

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[Message index]

		TCP Packets get lost under moderate network load By: klathor on Thu, 22 January 2009 22:22
		Re: TCP Packets get lost under moderate network load By: maratrus on Fri, 23 January 2009 11:28
		Re: TCP Packets get lost under moderate network load By: klathor on Fri, 23 January 2009 13:52
		Re: TCP Packets get lost under moderate network load By: klathor on Tue, 27 January 2009 15:03
		Re: TCP Packets get lost under moderate network load By: maratrus on Wed, 28 January 2009 07:29

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