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TCP hangs up [message #38565] Sat, 02 January 2010 23:08 Go to previous message
Sékiltoyai is currently offline  Sékiltoyai
Messages: 7
Registered: August 2009
Location: France
Junior Member
Hello,

Happy new year !

I have some problem with tcp on my VEs. The symptom is that some tcp (not tested with udp) connexions hang up with big files. It is very clear with ftp. And doesn't happen with http, because, i guess, apache can't reach same connexion rates (the problem only occur when i send data from the server).

I first assumed it was a netfilter problem but it occur even when policies are set to access. And it disappear when i set tcpsndbuf to really huge values (obviously it cannot be considered as a good solution Smile ).

I have seen some problems with tcpsndbuf on the bugzilla but it seems to have been solved in past kernel versions (mine is a Debian 2.6.26-2-openvz-amd64 ). Is it really the case ?
Shall i post a bug report or error is of my own ?

I have put in attachment the /proc/user_beancounters of the testing vps and the /etc/vz/conf/240.conf.
With this conf, the ftp transfer stop at approximately 6 or 7 megabytes, for a file of 10 megabytes.

Thanks for your help.

Best regards.

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