On Sun, 17 Jun 2007, M. Warner Losh wrote:
I have a friend who is having problems with a service he's running. He gets
billions and billions of connections to this service a day. Somewhere
between 10^8 and 10^9 connections, he notices that his servers lose the
ability to accept new connections. These are TCP connections.
This is with FreeBSD 6.1R. My first question is: does anybody know if the
fixes to -current/7.0 have fixed this? Is there a fix that can be back
ported? He's currently working around the problem by having a number of
different machines that reboot in a round robin fashion, but would like a
better solution.
I think we'll need some more detailed information to make headway. What does
"Lose the ability to accept new connections" mean, and how firmly is it meant?
Are we talking about "If you restart the application, it comes back" or
"Reboot reuiqred", "SYNs don't get SYN/ACK's" or "SYNs get RSTs", or what
exactly? There's a lot of scope for exploration, and plenty of bug fixes in
the tree, but it's hard to say whether any apply without a bit more detail.
Robert N M Watson
Computer Laboratory
University of Cambridge
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