Date: Thu, 12 Feb 2004 22:42:57 +0100 From: Emre Bastuz <info@emre.de> To: freebsd-net@FreeBSD.org Subject: 4.9-STABLE heavily dropping packets? libpcap issue? Message-ID: <1076622177.584b09df25514@webmail.emre.de>
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Hi, for sniffing purposes I have a FreeBSD 4.9-STABLE box running on highend, state-of-the-art hardware (Xeon something) with all bells and whistles. The NIC=B4s an onboard copper em0 with gig-e capabilities. Nevertheless I am getting massive packet drops (40%-60%) when I start sniffi= ng a gigabit ehthernet segment although the CPU load is very low. After doing some research in in the appropriate mailing list archives I foun= d out that there are (or were?) sometimes issues with the libpcap. As there wa= s a more current one in the ports collection (0.8.1 as opposed to 0.7 in the bas= e system) I used this instead (with LIBPCAP_OVERWRITE_BASE=3Dyes) but still I = am losing the same amount of packets when doing a tcpdump. I definitly do _not_ know what else I can do to reduce the amount of lost da= ta. *sigh* Things I did to improve the situation so far: - Update from RELEASE to 4.9-STABLE - Compile a custom kernel with reduced drivers and SMP support - Update libpcap and recompile tcpdump Does any of you have an idea else I can do? Any parameters in the kernel that can be tweeked further, like NMBCLUSTERS o= r NMBUFS? Cheers, Emre -- http://www.emre.de UIN: 561260 PGP Key ID: 0xAFAC77FD I don't see why some people even HAVE cars. -- Calvin ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.
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