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Re: Gigabit ethernet cards



On Mon, 2004-05-17 at 19:56, Alan Cox wrote:
> On Mon, May 17, 2004 at 06:18:47PM -0500, William Lovaton wrote:
> > > On desktop boxes the PCI bus typically ends up a bottleneck. Good servers
> > > tend to work out better - keep the disk and gige on different pci busses
> > > etc
> > 
> > Well, this server uses SCSI, so I guess there is no problem. Right?
> 
> Wrong. The SCSI has to be attached somewhere. If its a good server
> board (as I suspect all quad boards are) it should have the scsi one its
> own bus or sharing only with some slots - see the docs I guess.
> 
many "real" servers have multiple PCI buses, like one PCI-X133 for the
disk array controller for it's own... another for the HBA or SCSI
adapter, and some PCI64-66mhz slots for other components... it really
depends where you put the GIGE, if the card can use their potencial...

check if the slot used is a PCI-X, PCI64, PCI32 and of course in which
speed is running.. 133, 66 or 33 mhz... if you put a GIGE in a
pci32-33mhz the card should work but i doubt that it will work at a
reasonable speed... and even if it runs at full speed, the bus will be
busy for all the other devices...

another X in the equation is the use of bus mastering... 

 

> > I was wondering about CPU consumption.  Do you think that 4x 550MHz CPUs
> > are too slow for a GIGE??
> 
> Doing what ?  vmstat may give you some idea on cpu/disk usage and how much
> the cpus are idle
-- 
Christian B. Ellsworth Capo (k dicec cl)
Linux Chief Engineer
RedHat Certified Engineer (RHCE)


All Your Base Are Belong To Tux



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