From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Konstantin Boyanov <boyanov-/DgOsau14IQ@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: InfiniBand HCA loopback on a single host (subnet manager needed?)
Date: Wed, 9 Mar 2011 10:30:05 -0700 [thread overview]
Message-ID: <20110309173005.GN22729@obsidianresearch.com> (raw)
In-Reply-To: <alpine.LRH.2.00.1103090903140.15803-9mA5q7a405ob1SvskN2V4Q@public.gmane.org>
On Wed, Mar 09, 2011 at 09:04:39AM +0100, Konstantin Boyanov wrote:
> I think this is achievable on a single host by using the loopback
> capabilities of the InfiniBand HCA. The problem is, that I was not
> able to find a comprehensive description of how one sets up such
> loopback operation on the HCA chip.
To enable loopback I'm pretty sure you need an IB link on the
card, and a running SM to set the link the ACTIVE.
Also, be aware that in my experience loopback is a special case on IB
cards and the performance is not good, so testing in this manner may
not be valid.
If you have a dual port card you'd be better off connecting the ports
together and doing your test from port 1 to port 2.
Jason
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next prev parent reply other threads:[~2011-03-09 17:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-09 8:04 InfiniBand HCA loopback on a single host (subnet manager needed?) Konstantin Boyanov
[not found] ` <alpine.LRH.2.00.1103090903140.15803-9mA5q7a405ob1SvskN2V4Q@public.gmane.org>
2011-03-09 17:30 ` Jason Gunthorpe [this message]
[not found] ` <20110309173005.GN22729-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2011-03-09 18:24 ` Hal Rosenstock
[not found] ` <AANLkTimTm2UgUr4A_XJYGJpGBnRAFE74Eu6At+n9Xnfd-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-03-31 8:53 ` Konstantin Boyanov
[not found] ` <4D94411F.2080008-T5F83Mi6MZE@public.gmane.org>
2011-03-31 13:53 ` Hal Rosenstock
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