Intel 860 PCI bandwidth problem
sp at scali.com
Sat Jan 19 08:33:58 EST 2002
Greg Lindahl wrote:
> On Fri, Jan 18, 2002 at 10:40:37PM -0700, Maurice Hilarius wrote:
> > Implication: The early termination limits the maximum bandwidth to ~90 MB/s.
> That note sounds like it's not talking about DMA operation. You did
> look at the Myrinet Experiences website
I think you misunderstood, "memory read multiple" is the PCI instruction used by most DMA engines
(SCSI, ethernet, SCI and I would guess Myrinet) when they read from RAM (source machine). On the
other side (destination), "memory write invalidate" is normally used.
However, this errateadoesn't limit the SCI DMA bandwith to ~90MB/s either, 210MB/s is the most I've
seen so far.
Steffen Persvold | Scalable Linux Systems | Try out the world's best
mailto:sp at scali.no | http://www.scali.com | performing MPI implementation:
Tel: (+47) 2262 8950 | Olaf Helsets vei 6 | - ScaMPI 1.12.2 -
Fax: (+47) 2262 8951 | N0621 Oslo, NORWAY | >300MBytes/s and <4uS latency
Beowulf mailing list, Beowulf at beowulf.org
To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
More information about the Beowulf