Alexander Samad wrote: > On Thu, Jun 01, 2006 at 04:03:29AM +0200, Carl-Daniel Hailfinger wrote: >> Alexander Samad wrote: >>> On Thu, Jun 01, 2006 at 02:44:57AM +0200, Carl-Daniel Hailfinger wrote: >>>> Damjan wrote: >>>>>>> I wonder about the performance of a Linux box used as router (I guest I'm >>>>>>> not the first :). Althought I know it mainly depends on the hardware, I'm >>>>>>> trying to find some references on the topic or comparations with other >>>>>>> routing solutions (FreeBSD box used as router, Cisco, etc). For example, >>>>>>> http://facweb.cti.depaul.edu/jyu/Publications/Yu-Linux-TSM2004.pdf >>>>>>> (althought is related with Linux-briding more than with Linux-routing) shows >>>>>>> in Figure 14 that with an AMD Duron 1.3GHz 512M RAM a throughput of 90 Mbps >>>>>>> can be achieved. >>>>>> On an AMD Athlon64 3200+ (2 GHz) I was able to saturate 2 PCI-Express >>>>>> gigabit cards (but that was with 1500 byte packets). Never tried more >>>>>> although the box has 6 interfaces capable of gigabit, 4 of them attached >>>>>> via PCI-Express. >>>>> But that's _only_ 83333 packets/s isn't it. >>>> Hm. How do you arrive at that result? I get twice the numbers. >>>> nic a: 1 gbit in -> nic b: 1 gbit out >>>> nic b: 1 gbit in -> nic a: 1 gbit out >>>> total 2 gbit >>>> 2 gbit /(1500*8 bit/frame) ~ 160k packets/s >>>> >>>> Please note that I did not test with smaller frame sizes, so 1Mp/s >>>> may be possible (I'll test that if I have some spare time). >>> what if you test inbound and outbound at the same time - the cards >>> should be capable of full duplex ? >> I tested 1 gbit in and 1 gbit out per nic at the same time. That's >> how I arrived at my results. > sorry I might be being very dense on this, but 2 nics 1G in and out > shouldn't that be > 4gbit / (1500*8 bit/frame) ~ 320k packets/s No, because you can count each packet passing through the router only once. If the machine works as a router, each entering packet also has to leave, so if the router has 2 interfaces A+B, you can have 1 Gbit from A to B and 1 Gbit from B to A. Your calculation would be correct if the machine is a server and generates and consumes all traffic locally. > My presumption is that the nic can send and recieve at the same time Yes. Regards, Carl-Daniel -- http://www.hailfinger.org/ _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
