Date: Tue, 14 Jun 2005 09:09:07 -0400 From: "PSI, Mike Smith" <mlsmith@mitre.org> To: <freebsd-net@freebsd.org> Subject: Advice needed on running idiotic test for client Message-ID: <06e401c570e2$3f342930$1b321d80@MITRE.ORG>
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Hey all, Need some probably fundamental help with an admitted idiotic "test" from a client. Is there any way to close a TCP connection such that all resources are immediately freed? Standard operation: Sys B Listen -> Sys A connect -> Sys B Accept -> Sys A Send -> Sys B Receive -> Sys A Close -> Sys B Close (still listening). Very small packets. Maximum connect rate is less than 50 or so per minute, often much less. No problems at all. Idiot test requested by client - Same as above but see how fast 10,000 can be sent (will never come close to happening in the real world). Problem: Because among other things I am using let's say minimal and ancient computer power, I hit a DOS state after about 3700 connects. I know (think?) I am running out of mbufs because of the 2MSL delay on the close. Is there any way to close a TCP connection and have all resources immediately freed? I KNOW this is really violating all the data integrity features of TCP, but this is an idiotic test remember. And in this case I am not concerned about data integrety. I have noticed that LINUX has a TCP_LINGER2 option that can at least minimize the closing delay (freeing resources) but I haven't found anything comparable in FreeBSD. Since this is probably fundamental and of little or no interest to anyone designing or operating even a minimally competent system, off-list response is probably best if someone would be so kind as to help me out. Mike Smith
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