Re: [myrinet] RE: Re: Low bandwidth

On Tue, Jul 31, 2001 at 12:51:14PM -0400, Tenhave, Tim wrote:
> Hi,
> 
> I would try moving the Myrinet board into other slots.  I do not have access
> to an AS500 today, but I do know it contained 2 (or 3) PCI buses and you may
> be competing for resources from other devices in the bus you are on.  You
> can help yourself determine the nature of your bus by using the SRM "show
> config | more" command and attempt to move your Myrinet board to a quieter
> bus.  Realize the slot numbers provided are logical slots and not physical
> slots.
> 
> If you need more details, send email.
> 
> Tim
> 
> Compaq/DEC Alpha guy who uses Myrinet too.
>   

this is the show config output:



PCI Bus
     Bus 00  Slot 06: DECchip 21040 Network Controller
                                   ewa0.0.0.6.0
00-00-F8-22-F9-E2
 
     Bus 00  Slot 07: Cateyes - 4D40T
     Bus 00  Slot 08: DE500-BA Network Controller
                                   ewb0.0.0.8.0
00-00-F8-10-C9-63
 
     Bus 00  Slot 09: ISP1020 Scsi Controller
                                   pka0.7.0.9.0          SCSI Bus ID 7
                                   dka0.0.0.9.0           RZ29B
                                   dka400.4.0.9.0         RRD45
 
     Bus 00  Slot 10: Intel   8275EB PCI to Eisa Bridge
 
 
     Bus 00  Slot 11: Vendor: 14c1  Device: 8043
     Bus 00  Slot 12: Cateyes - VGA Daughter Card



I could remove the powerstorm graphic card (slots 7/12).
Currently only slot8 is used as fastethernet controller.
Any hints?




> On Tue, 31 Jul 2001, Francesco Lovergine wrote:
> 
> >
> > Hello folks
> >
> > I just built up my first beowulf cluster with the latest PCI64B-2
> > cards (PCI64C was available just a month later our order :-().
> > Hosts are all DEC Alphastation 500/500 (alcor arch). OS is Linux
> > with kernel 2.2.19. Buses are 32bits @ 33Mhz so my guess is at least
> > a 100-130MBs of throughput. In fact, reality is well different...
> > gm_allsize gives me a maximum bandwith of 56MBs.
> > Any hints?
> >
> > PS: This is a Debian GNU/Linux cluster, not the boring RH flavor...
> > hip, hip, hurrah for the Debian Project...
> >
> >
> 
> -- 
> ________________________________________________________________
> Clemens Adler                      phone: (631)344-8334
> Bldg. 510A                         email: [email protected]
> Brookhaven National Lab
> Upton N.Y. 11973                   Office: Bldg. 118  Rm. 103
> ________________________________________________________________

-- 
Francesco P. Lovergine