Date: Fri, 17 Sep 2004 13:02:30 +0200 From: Marko Zec <zec@icir.org> To: freebsd-net@freebsd.org, donatas <donatas@lrtc.net> Subject: Re: ng_one2many - very slow Message-ID: <200409171302.30120.zec@icir.org> In-Reply-To: <030a01c49c9f$7c215970$f2f109d9@donatas> References: <030a01c49c9f$7c215970$f2f109d9@donatas>
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On Friday 17 September 2004 12:17, donatas wrote: > Hello, > > we need a 400Mbit link between two intel machines (Xeon 2.4, Raid, > 512DDr, 2 ports-em(1000Mbit),2 ports-fxp(100Mbit)) > > .... > > truth, we've tested direct link between em adapters in gigabit mode > and using TCP packets 850Mbit throughput was achieved. And Nearly > 1Gbit with UDP packets. > > as you see one2many test results aren't even close to 400Mbit > Is it possible that em and fxp cannot work together or something. > what can you suggest to solve this small problem? Perhaps TCP packets are arriving out of order for some reason (interrupt coalescing etc.) which can be _bad_ for TCP throughput. What kind of CPU load are you observing on those machines, when testing a single Gbit link versus a 4*100M bundle? Marko
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