Date: Mon, 20 Jun 2005 13:50:44 -0700 From: Luigi Rizzo <rizzo@icir.org> To: Pieter de Boer <pieter@thedarkside.nl> Cc: freebsd-net@freebsd.org Subject: Re: Issues with a Large Fat pipe Network simulation Message-ID: <20050620135044.B35720@xorpc.icir.org> In-Reply-To: <42B722EF.2090203@thedarkside.nl>; from pieter@thedarkside.nl on Mon, Jun 20, 2005 at 10:11:27PM %2B0200 References: <42B722EF.2090203@thedarkside.nl>
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On Mon, Jun 20, 2005 at 10:11:27PM +0200, Pieter de Boer wrote: > Hello there, ... > When testing without any extra delay on 'network' and send/recvspaces of > 65535 bytes, we can sustain around 800mbit/s. The interrupts on > 'network' may be the limiting factor here. However, when we set the > send/recv space to 65535*2, we can only sustain around 200-300mbit/s. It have you checked that these two kern.ipc.maxsockbuf: 262144 kern.ipc.sockbuf_waste_factor: 8 aren't responsible for the trouble ? I won't enter into details because i am not sure but try upping maxsockbuf might help. Or not. in any case it would be nice to try and let us know cheers luigi > seems the speed isn't as 'stable' either (peaks of more than 300mbit/s, > sometimes up to 500mbit/s). We also used read/write sizes of 128KB using > the -l option on iperf, but this didn't seem to have any noticeable > effect. > > When adding extra latency on 'network' and adjusting the > send/recv-spaces to correct for the greater bandwidth*delay product, we > weren't able to sustain rates much higher than 200mbit/s either. > > > Can anyone shed some light on what we're seeing here? > > -- > With regards, > Pieter de Boer > > _______________________________________________ > 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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