Date: Tue, 14 Jun 2005 16:19:01 -0500 (CDT) From: Mike Silbersack <silby@silby.com> To: "PSI, Mike Smith" <mlsmith@mitre.org> Cc: freebsd-net@freebsd.org Subject: Re: Advice needed on running idiotic test for client Message-ID: <20050614161717.M8134@odysseus.silby.com> In-Reply-To: <06e401c570e2$3f342930$1b321d80@MITRE.ORG> References: <06e401c570e2$3f342930$1b321d80@MITRE.ORG>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, 14 Jun 2005, PSI, Mike Smith wrote: > 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. Are the TIME_WAIT sockets building up on the client or the server? 5.x has some features so that it does not allow too many TIME_WAIT sockets to build up beyond a certain threshold, but if you're using 4.x we can still tweak some sysctl values to achieve the effect you want. Mike "Silby" Silbersack
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050614161717.M8134>