Re: Linux support for RDMA (was: [Ksummit-2005-discuss] Summary of 2005 Kernel Summit Proposed Topics)

[Grant Grundler <grundler@xxxxxxxxxxxxxxxx>]

On Sun, Apr 03, 2005 at 05:56:11PM -0700, Dmitry Yusupov wrote:
> I do not get your concern with memory BW. With good AMD box V40Z(SUN)
> you can get 5.3GBytes/sec. Even with 10Gbps full speed you have 80%
> left. PCI-X BUS BW is bigger concern...

Yes and No. PCI-X isn't fast enough but the data only crosses
the PCI-X bus once.  Think about the data flow:
        1) DMA to RAM
        2) load into CPU cache
        3) store back into RAM

We are down to 40% left...graphics folks won't like you.

grant