Re: bigphysarea support in 2.2.19 and 2.4.0 kernels

Jeff V. Merkey
2000-12-22T23:32:07Z

On Fri, Dec 22, 2000 at 10:39:43PM +0100, Erik Mouw wrote:
> On Fri, Dec 22, 2000 at 02:54:50PM -0700, Jeff V. Merkey wrote:
> > Having a 1 Gigabyte per second fat pipe that runs over a prallel bus
> > fabric with a standard PCI card that costs @ $ 500 and can run LVS
> > and TUX at high speeds would be for the common good, particularly since
> > NT and W2K both have implementations of Dolphin SCI that allow them
> > to exploit this hardware.
>
> I'm just wondering how you are going to do 1 Gbyte per second when you
> still have to get the data through a PCI bus to that card. In theory,
> standard PCI can do 133 Mbyte/s, but only when you're very lucky to be
> able to burst large chunks of data. OK, 64 bit PCI at 66 MHz should
> quadruple the throughput, but that's still not enough for 1 Gbyte/s.

THe fabric supports this data rate. PCI cards are limited to @ 130MB,
but multiple nodes all running at the same time could generate this much
traffic.

Jeff

>
>
> Erik
>
> --
> J.A.K. (Erik) Mouw, Information and Communication Theory Group, Department
> of Electrical Engineering, Faculty of Information Technology and Systems,
> Delft University of Technology, PO BOX 5031, 2600 GA Delft, The Netherlands
> Phone: +31-15-2783635 Fax: +31-15-2781843 Email: J.A.K.Mouw@its.tudelft.nl
> WWW: http://www-ict.its.tudelft.nl/~erik/