Date: Fri, 7 Mar 2003 13:10:39 +0000 From: Bruce Cran <bruce@cran.org.uk> To: hackers@freebsd.org Subject: High CPU usage when forwarding packets Message-ID: <20030307131038.GA919@fourtytwo.brucec.backnet>
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I've just setup a P75 system as a router, containing fa311 and pcnet network cards. The fa311 is doing nat to my private network, which is served by the pcnet card. However, I've found that it often uses 40% cpu just to send packets from the fa311 (sis) to the pcnet (lnc) cards. natd uses 20%, 10% are interrupts, and 25% is 'system' as shown in top. Also, I'm getting several thousand 'lnc0: Missed packet -- no receive buffer' messages. Could this be the problem, or is the system just not powerful enough do nat? The sis0 card is 100MBit PCI, while the lcn0 is 10MBit ISA. Bruce Cran To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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