On Wednesday 09 May 2012 10.20.47 Jeff Squyres wrote:

...

> I don't have any QDR or FDR equipment -- what's the typical active_width for

> QDR and FDR?

>

> QDR is 32000, so is that active_speed of 4 and active_width of 4? (8000 * 4

> = 32000)?

>

> FDR is 56000 (right?

 

Pretty much all IB is 4x to host.

 

4x QDR is 40 Gbps at link level => 8 Gbps data per link (8/10 coding)

4x FDR10 is 40 Gbps at link level => ~9.7 Gbps data per link (64/66 coding)

4x FDR is 56 Gbps at link level => ~13.5 Gbps data per link (64/66 coding)

 

/Peter

 

> I haven't kept up with IB specs since Cisco killed

> IB...), so what are its active_speed and active_width values?

 

--

-= Peter Kjellstr÷m

-= National Supercomputer Centre