Hi everyone; Thank you all for your valueable answers. For summarizing the solutions, to overcome the problem about getting high troughput on ethernet devices: 1- Use NAPI version of ethernet drivers(I didnt hear its implemented for 440gx) 2- Change the processor with an much powerful one(like 8540, and I think there was also a NAPI driver for this processor, so it can also cover the first solution) 3- Use network processor
The third solution is an expensive one,my project is not at that huge, so I eliminate this. And my question, I have good hardware and mid level linux device driver knowledge, but I never wrote an ethernet driver. Is there a lot of work for 440gx NAPI driver,can I write it easly,if so where can I start,(or did someone make it before?) or must I throw 440gx eval board to waste basket and buy a new platform? Thank you all.. Emre --- "Howell, Kyle" <Kyle.Howell at barco.com> wrote: > Hi Emre, > > I am not familiar with the Linux network driver for > the 440, but the first > thing I would check is that your network driver is > using the new NAPI. With > packets as small as 64 bytes, this kind of interrupt > traffic would floor any > processor without some form of coalescing. > > I am currently achieving ~800Mbits/sec throughput on > a Motorola MPC8540 > @800MHz (very comparable to the 440, AFAIK). That > project involves passing > data from a non-network interface onto the network > and vice-versa. Achieving > that speed required using the NAPI version of the > net driver and using 4KB > packets (Jumbo packets). I don't know how great the > hit would be if that was > network-network traffic or if we were doing anything > more complex than > simple data routing. > > I suspect that unless your encryption is hardware > accelerated, you won't > have a chance with anything less than a full > multi-GHz processor. The other > tasks could probably manage your required 200Mb/s on > the 440 with enough > tuning, though I'm not confident that would be true > with packets as small as > 64Bytes. > > Regards, > Kyle Howell > Engineer, BarcoView LLC > kyle.howell at barco.com > > > -----Original Message----- > From: linuxppc-embedded-bounces at ozlabs.org > [mailto:linuxppc-embedded-bounces at ozlabs.org]On > Behalf Of emre kara > Sent: Thursday, February 17, 2005 9:11 AM > To: linuxppc-embedded at ozlabs.org > Subject: High processing power and gigabit interface > > > Dear All, > I'am not sure if this kind of question can be asked > on > this mail-list, if not, sorry about it. > In my project, we need high processing power on > gigabit network interfaces. our system will achive > routing,nat, encryption at minimum 200 Mbits > bandwith. > Firstly we decide to use amcc 440gx(ocotea)(because > of TAH,2 gigabit interfaces etc..) and I had loaded > linux kernel 2.6.10 and also denx's 2.4 kernel for > our > board..(with our (linux community) valueable > helps..thanks alot..) > I have tested 440gx routing performance with this > two > kernels, for doing this, we had send 64 bytes > packets > between two computer,but we could'nt see much more > then 40Mbits routing performance on this tests. I > think the problem with hardware, we have reached the > limits. > I need your suggestions,which processor is suitable > for our app or where am I wrong. > Thanks alot for the answers. > Emre > > > > > > ___________________________________________________________ > > ALL-NEW Yahoo! Messenger - all new features - even > more fun! > http://uk.messenger.yahoo.com > _______________________________________________ > Linuxppc-embedded mailing list > Linuxppc-embedded at ozlabs.org > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > Send instant messages to your online friends http://uk.messenger.yahoo.com
