Re: Consine FW

[Nimesh Vakharia <nvakhari () clio rad sunysb edu>]

> One trick is that the E450 has 6 separate PCI busses (some high/wide, 
> some low/standard width IIRC)- so the Gig cards should be situated on 
> different busses to avoid PCI bus saturation. A common PCI bus has 
> 32bit@33MHz = 990 Mbit/s which is the equivalent of a Gig card run half 
> dumplex. So seek one of the 64bit@33MHz or 32bit@66MHz or 64bit@66MHz 
> PCI busses the E450 provides (sorry, I currently don't have the manuals 
> at hand). And keep the PCI bus used by the Gig card free of other stuff.
> This way you avoid the bus limit.
>
> 60-80 Mbit/s sound awfully alike to the throughput limit of a 100 mbit/s 
> shared ethernet. Are you sure that there was no dumb switch involved on 
> one of the testing sides? Sometimes - especially when routing broadcasts 
> - switches are programmed to wait for the slowest interface...
        Not sure what u mean by; swithes are programmed to wait for the
slowest interface but, there were no switches involved. This
was an all back to back from one interface of the Ixia(similar to
smartbits) into the E450 and back. The actual comparison was made against
the fact when the FW disabled, the throughput jumped up by 5-6 times as
much.
        I'd think that one would buy a 64bit Gig card but then again I'm
only speculating. ;)

Nimesh.

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