[ixp1200] ix bus throughput limitations

[Mohammad Shorfuzzaman]

Hi,
I have tried to build and debug the single thread packet receiving and counting
program from the IXP1200 book in simulation mode. But I could not debug it
successfully because the simulation halts giving an error:" FBUS logic-
unexpected encoding on incoming byte enables:ff ". Debugging stops at the
"ctx_receive(start_receive)" line in the get_mpacket() function. 

Does anybody have any idea to help me in this regard?

Thanks.
Mohammad Shorfuzzaman

Quoting liam noonan <liam.noonan at ul.ie>:

> Hi,
> 
> I have carried out some testing  on a single thread process receiving 
> and counting packets (code from chapter 5 from ixp 1200 book)
> When it runs at wire speed at 177Mhz and Ixbus at 66 Mhz it has a 
> receive rate of 350 Mbps at the IX bus.
> The same rate is achieved when running at 200Mhz, Ixbus at 66Mhz. I 
> would expect the receive rate to be faster.
> 
> Does anyone have any idea as to why the receive rate isn't higher for 
> 200MHZ?
> 
> Thanks
> Liam Noonan
> Univeristy Of Limerick
> 




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