Date: Thu, 28 Apr 2011 15:25:53 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Adam Stylinski" <kungfujesus06@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: em0 performance subpar Message-ID: <EE019B72D65E417BABD7022E4DF10357@multiplay.co.uk> References: <20110428072946.GA11391@zephyr.adamsnet> <4DB965D8.7090906@sentex.net> <B04EE072E7F04402AC289EFBF55E1D05@multiplay.co.uk> <20110428141339.GD2800@ossumpossum.geop.uc.edu>
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* What's your traffic like? e.g. http, large tcp files, tiny udp etc...
* Is it all on a local switch, if so what switch?
* Is flow control enabled?
* Are you seeing high interrupts?
* Are you disk bound?
* Are you memory bound?
* Are you cpu bound?
Some basic settings we have here:-
net.inet.tcp.inflight.enable=0
net.inet.tcp.sendspace=65536
kern.ipc.nmbclusters=262144
kern.ipc.maxsockets=204800
net.inet.tcp.msl=20000
kern.ipc.maxsockbuf=524288
net.inet.tcp.sendbuf_max=16777216
net.inet.tcp.recvbuf_max=16777216
Note: Large values for kern.ipc.maxsockbuf can hurt performance under
8.x but work well under 7.x (never got to the bottom of that)
Regards
Steve
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