Date: Thu, 20 Feb 2003 11:23:17 -0500 From: "Will Saxon" <WillS@housing.ufl.edu> To: <questions@freebsd.org> Subject: network tuning Message-ID: <0E972CEE334BFE4291CD07E056C76ED8DB2B69@bragi.housing.ufl.edu>
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I am trying to use ntop in the 'border filter' mode to get some = statistics on that link, which is a gigE link typically seeing = 40-120Mbps sustained traffic (varies throughout the day). The capturing = interface is an intel pro/100+ server adapter, plugged into another port = on the switch set to mirror the gigE interface. Obviously there ought to be some drops due to serialization differences, = etc. But ntop is reporting upwards of 2/3 packets dropped in the kernel = and running tcpdump on that interface for any length of time reports = usually 50% drops in the kernel. I have enabled the link0 processing offload onto the nic, changed the = nmbclusters sysctl, and raised all of the send/recvspace sysctl's. I = read the tuning manpage, and applied whatever looked applicable with no = discernable results. The system is running FreeBSD 4.8-PRERELEASE. Machine is a dual p3 = 1.4GHz with 2.2GB ram and 1 15krpm IBM SCSI drive on a LSI/symbios logic = u160 card. It is using a via chipset tyan tiger 230T, which is = understandably nothing special.=20 Is there something else I should try, besides getting a gigE card (and = gbic) to try again? I feel like I am not setting something up correctly. -Will To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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