Date: Mon, 20 Jun 2005 23:14:53 +0200 From: Pieter de Boer <pieter@thedarkside.nl> To: Luigi Rizzo <rizzo@icir.org> Cc: freebsd-net@freebsd.org Subject: Re: Issues with a Large Fat pipe Network simulation Message-ID: <42B731CD.1040104@thedarkside.nl> In-Reply-To: <20050620135044.B35720@xorpc.icir.org> References: <42B722EF.2090203@thedarkside.nl> <20050620135044.B35720@xorpc.icir.org>
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Luigi Rizzo wrote: >>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've seen 200-300mbit when using a 1MB maxsockbuf. Raising it to 2, 4 or 8MB doesn't seem to have much (if any) effect. Altering sockbuf_waste_factor doesn't seem to do anything, either. However.. when I deleted the pipe rules on 'network', the speed suddenly went up to around 800mbit/s too! I remade them, and voila, 200mbit/s. So apparantly it's an issue in the dummynet configuration I have. So, to reiterate: On 'network': pipe 1 from client to server via em0 pipe 2 from server to client via em1 allow ip from any to any Will give me 200MBit/s when using 128KB window sizes, but 800MBit/s when using 64KB window sizes. On 'network': allow ip from any to any Will give me 800Mbit/s when using 64KB or 128KB window sizes. I haven't configured the pipes in any way, though. So it appears it's due to the 'network' box afterall.. -- Pieter
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