[openib-general] ip over ib throughtput

[Grant Grundler]

On Wed, Jan 12, 2005 at 02:37:45AM +0200, Michael S. Tsirkin wrote:
> > That's the beauty of bcm57xx. The DMA/Intr ordering is handled by passing
> > tags back of forth - so the NIC knows which status block the host saw
> > on the current interrupt. It might result in a spurious interrupt
> > on occasion but very portable IMHO.
> 
> Does this mean that after MSI wa asserted, and before status is passed
> back, no more messages of the same kind are sent?

BTW, ideally, the card will DMA status back and then "chase" the status
DMA with an MSI. Thus the status is guaranteed to be visible before
the MSI is delivered. bcm5700 takes that a step further by using
"tags" to guarantee ordering was preserved.

grant