[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?

No more MSI are sent until the host ACKs it with a write.
The ACK "msg" (MMIO Write) also contains the tag of the
status block that was seen by the host.

grant