Date: Fri, 26 Mar 2004 11:08:47 -0800 From: Bakul Shah <bakul@BitBlocks.com> To: "Marc G. Fournier" <scrappy@hub.org> Cc: freebsd-net@freebsd.org Subject: Re: Looking for switch recommendations ... Message-ID: <200403261908.i2QJ8lHA078562@gate.bitblocks.com> In-Reply-To: Your message of "Fri, 26 Mar 2004 14:29:56 -0400." <20040326141509.G90406@ganymede.hub.org>
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> What is the difference between Layer2 and Layer3, and what does that > affect? Layer3 == routing (based on IP destination address) Layer2 == switching (based on enet dest. address) Layer3 is probably not important for you. > HP: > Throughput: 2650 - 10.1 mpps (64-byte packets) 2626 - 6.6 mpps (64-byte packe > ts) > Switching capacity: 2650 - 13.6 Gbps 2626 - 9.6 Gbps > > Dell: > Switch Fabric Capacity 8.8 Gb/s > Forwarding Rate 6.5 Mpps > > So, in both cases, the HP is faster, but ... is that 6.6mpps "per port" > (ie. the pp?) ... right now, I'm seeing max of around 3Mps going out a > server, with average being well below 1 ... so I can't see hitting that > high any time soon ... For 100Mbps ports, the max packet rate in one direction is 10^8/672 == 148809 pps (packets per sec) per port. So for 24 port full duplex ports you get an aggregate maximum throughput of 148809*24*2 = 7738068 = 7.14Mpps (Million pps). For a 48 port switch it is 14.29Mpps.
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