Date: Mon, 30 Jun 2008 22:40:21 -0400 From: Paul <paul@gtcomm.net> To: Ingo Flaschberger <if@xip.at> Cc: freebsd-net@freebsd.org, "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au> Subject: Re: Freebsd IP Forwarding performance (question, and some info) [7-stable, current, em, smp] Message-ID: <48699915.4020804@gtcomm.net> In-Reply-To: <alpine.LFD.1.10.0807010257570.19444@filebunker.xip.at> References: <4867420D.7090406@gtcomm.net> <200806301944.m5UJifJD081781@lava.sentex.ca> <20080701004346.GA3898@stlux503.dsto.defence.gov.au> <alpine.LFD.1.10.0807010257570.19444@filebunker.xip.at>
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Well it's supposed to, but it doesn't seem to do it as well as it should :> How about copying header direct DMA from NIC into cache, then copy from cache into output NIC after applying whatever filters/changes/etc? Ingo Flaschberger wrote: > Dear Alex, > >> >OK, I setup 2 boxes on either end of a RELENG_7 box from about May >> >7th just now, to see with 2 boxes blasting across it how it would >> >work. *However*, this is with no firewall loaded and, I must enable >> >ip fast forwarding. Without that enabled, the box just falls over. >> >> What is "ip fast forwarding" ? > > instead of copying the while ip packet into system memory, only the ip > header is copyied and then in a "fast" path determined if it could be > fast forwarded. > if possible, a ned header is created at the other network-cards-buffer > and the ip-data is copied from network-card-buffer to > network-card-buffer directly. > > Kind regards, > Ingo Flaschberger > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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