RE: High processing power and gigabit interface

RE: High processing power and gigabit interface

[emre kara]

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@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@barco.com
> 
> 
> -----Original Message-----
> From: linuxppc-embedded-bounces@ozlabs.org
> [mailto:linuxppc-embedded-bounces@ozlabs.org]On
> Behalf Of emre kara
> Sent: Thursday, February 17, 2005 9:11 AM
> To: linuxppc-embedded@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@ozlabs.org
>
https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>  

Send instant messages to your online friends http://uk.messenger.yahoo.com 

RE: High processing power and gigabit interface

[emre kara]

I'am sorry.
I have found a NAPI driver for 440gx on an old topic.
I'll test it on our gigabit test platform.
Thanks.
Emre
--------------------------------------------------
There is an experimental PPC4xx NAPI EMAC driver,
which has 440GX 
support (GigE, TAH, scatter-gather, jumbo) for
2.4.30-pre1 (2.6 
version will follow shortly).

Patch can be found at http://kernel.ebshome.net/.

Please, note, full 440GX support is newly added
feature and therefore 
don't consider it stable yet. I'm in process of
testing it. So, use 
it at your own risk.
Eugene Surovegin
------------------------------------------
 

Send instant messages to your online friends http://uk.messenger.yahoo.com 

Re: Mounta Vista Linux prompt on serial console

[Wolfgang Denk]

In message <EF9B29C78F41FA488927FCBC7750AF0E08DA14@hyd-mdp-msg.wipro.com> you wrote:
> 
> But the problem is that it was stopping at
> 
> "No init found.  Try passing init= option to kernel". Before that there
>  were no errors. Everthing looks fine Mounted VFS root file system was also

Fine. So you can mount the root filesystem, but it obviously does not
contain all the required files.

>  seen. From the net I understood is that the fstab file was the cause. So
>  edited the filesytem parameter for / as /dev/ram earlier it used to be
>  /dev/root.

No. /etc/fstab has absolutley nothing to do with  your  problem.  The
kernel  cannot  start  the  init  porocess - make sure init is in the
filesystem, plus all required libraries.

> So please tell me whether the given fstab file will suffice? The filesystem

This is completley unrelated.

> 2. I have one more doubt /sbin/init utility comes with what package?
>  Because in /sbin directory although the init binary is present, not shown
>  in the file system heirarchy view. For eg. if I select DHCPD package then
>  able to see dhcpd related binary in the /sbin similarly my question was
>  which package has to be selected to have init included.

Please contact MV support. I have no  idea  how  they  package  their
distribution,  or  how  their  config  tools might work. You paid for
their stuff, so ask _them_.

Best regards,

Wolfgang Denk

-- 
See us @ Embedded World, Nuremberg, Feb 22 - 24,  Hall 10.0 Booth 310
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
                                                      -- Isaac Asimov

High processing power and gigabit interface

[emre kara]

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