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Subject: [OMPI devel] FDR: bad patch? (was: 1.6rc3 is out)
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2012-05-09 10:20:47


On May 9, 2012, at 9:52 AM, <Ludovic.Hablot_at_[hidden]> wrote:

> About changeset 26385: ompi/mca/btl/openib/btl_openib_component.c
>
> I might be wrong but I think that the speed we put in openib_btl->super.btl_bandwidth is the speed of one link. It will be multiply by the number of links (*4, ib_port_attr->active_width) to obtain the correct speed.
>
> Thus, the correct speed should be 8000 and not 32000. I joined a potential patch if I'm right.

I think you might be right, but then how is case 4 different than case 8?

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? I haven't kept up with IB specs since Cisco killed IB...), so what are its active_speed and active_width values?

-- 
Jeff Squyres
jsquyres_at_[hidden]
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