Date: Wed, 11 Jul 2001 17:12:43 +0200 (CEST) From: Martin Karsten <Martin.Karsten@KOM.tu-darmstadt.de> To: freebsd-net@freebsd.org Cc: oscar@ac.upc.es Subject: UDP packet loss on FreeBSD 4.x Message-ID: <200107111512.RAA30280@KOM.tu-darmstadt.de>
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Greetings, I have observed the following behaviour on FreeBSD 4.x platforms (4.0 till 4.3 seem to be affected). When receiving a sufficiently fast stream of UDP packets (the borderline seems to be around 3,500 packets/sec for e.g. the 'xl' driver on a 450MHz Pentium), an application on the receiving host does not receive all packets anymore, depending on which nic driver is used. A fraction of the lost packets is reported in net.inet.ip.intr_queue_drops, but not all. Tests have shown that the losses occur for the 'xl' or 'ti' drivers, whereas the 'fxp' and 'de' driver don't seem to be affected. On FreeBSD 3.4, no such losses happened and one could easily transmit more than 10,000 packets/sec between adjacent machines. Is this a knowm problem and is there a chance that it is fixed? Is there potentially a quick solution for it? Further, might this problem be related to an earlier report (08 Jan 2001) sent with the subject "On the performance of the xl driver" by Oscar-Ivan Lepe-Aldama? Thanks in advance, Martin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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