[tproxy] TPROXY performance on CentOSv6

[Ritter, Nicholas]

I am testing TPROXY with Squid v3.1.14 on CentOS v6 and noticed several
TCP-performance related problems were squid is failing due to TCP
session handling issues. CentOS v6 is  running a 2.6.32-71.29.1 kernel,
and I saw a TPROXY listserv posting from Nov 10, 2010 about
TPROXY/Kernel hanging issues and a fix that was merged in and after
2.6.37.

My question is if this issue could be the root cause of the problems I
am seeing, and if anyone had suggestions for further debugging and
solutions. Squid is reporting a higher than normal number of 502 BAD
GATEWAY errors and some websites consistently not working. I have
testing the squid install without TPROXY and the errors go away, so I
know it is TPROXY related.

If upgrading the kernel is the way to go, that gets hairy with CentOS
and I am not sure which method is the best way to go for upgrading the
kernel.

Any thoughts or suggestions?

Nicholas