Date: 02 Aug 2001 17:08:32 -0400 From: stanislav shalunov <shalunov@internet2.edu> To: net@freebsd.org Subject: Re: TCP problems with large window sizes on FreeBSD (GigaTCP) Message-ID: <87n15inp9r.fsf@cain.internet2.edu> In-Reply-To: <87y9p2qxvc.fsf@cain.internet2.edu> References: <200108020503.f7253jY08157@prism.flugsvamp.com> <87y9p2qxvc.fsf@cain.internet2.edu>
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stanislav shalunov <shalunov@internet2.edu> writes: > I'll try increasing the value of TI_JSLOTS to 8192 (twice the number > of 4K packets in 16MB window) and see if it makes a difference. FWIW, this seems to have improved the situation and the burst loss doesn't happen anymore. For those who might care to look at the new numbers, see http://www.internet2.edu/~shalunov/gigatcp/ There seems to be a problem with the ti driver in that it doesn't recover from the situation of jumbo slots shortage right away after supply of packets is removed, as one would expect it to. The condition lingers for a long time afterwards. It seems to recover eventually, but after quite different time for diffirent conditions: sometimes it's seconds, sometimes it's minutes. The "slow" case appears to be an example of fast periodic recovery, while in the "stalled" case the recovery doesn't happen until the TCP connection times out. -- Stanislav Shalunov http://www.internet2.edu/~shalunov/ "I didn't attend the funeral, but I sent a nice letter saying that I approved of it." -- Mark Twain To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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