Date: Fri, 19 May 2006 13:27:53 -0700 From: Julian Elischer <julian@elischer.org> To: Thomas <freebsdlists@bsdunix.ch> Cc: freebsd-net@freebsd.org, Marcin Jessa <lists@yazzy.org> Subject: Re: trunk interface (was (no subject)) Message-ID: <446E2A49.1070606@elischer.org> In-Reply-To: <1148025237.38606.6.camel@bert.mlan.solnet.ch> References: <C378B27F-22B6-4905-9BE8-54BF47A400A7@bsdunix.ch> <20060518220945.f81a743a.lists@yazzy.org> <FCF0E8B5-C60F-4B87-810A-289C2D948B83@bsdunix.ch> <446D19E7.2010804@elischer.org> <1148025237.38606.6.camel@bert.mlan.solnet.ch>
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Thomas wrote: >Am Donnerstag, den 18.05.2006, 18:05 -0700 schrieb Julian Elischer: > > >>Thomas Vogt wrote: >> >> >> >>>Hi >>> >>>Thanks. I know about the netgraph ether/fec interfaces. But I thought >>>about a solution without netgraph. AFAIK Netgraph implies overhead >>>and ng_ehter is more complicated to set up. This is a problem with >>>non technical people. I'm happy they already know a bit about >>>ifconfig commands. >>> >>> >>two items. >>1/ ng_fec only uses the config framework of netgraph. For data it goes >>direct to the interfaces. >> >> > >Ah good to know. Since this is for a network course it would be easier >if this "trunk" could be setup via ifconfig command. But I will try it. > > > >>2/ netgraph is not that high an overhead. (what made you think it was?) >> >> > >Well I heard that netgraph has some overhead on various conferences. I'm >planning to use such a feature on very very high loaded GigE router, >every extra kernel hook could cost some performance, IMHO. > > it is possible that the extra overhead in netgraph may influence such a high throughput system, but one would have to test to know how much.. its overhead is nto as high as one might think, despite the fact that it was not designed to handle such high throughputs, it does a reasonable job. it is possible that the use of netisr() in some places slows it down however.. >Thanks and cheers, >Thomas > >
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