netdev - Re: [PATCH v4 01/13] Linux RDMA Core Changes

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Message-ID: <20070103151015.GQ6019@mellanox.co.il>
Date:	Wed, 3 Jan 2007 17:10:16 +0200
From:	"Michael S. Tsirkin" <mst@...lanox.co.il>
To:	Steve Wise <swise@...ngridcomputing.com>
Cc:	Roland Dreier <rdreier@...co.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, openib-general@...nib.org
Subject: Re: [PATCH  v4 01/13] Linux RDMA Core Changes

> > > I've run this code with mthca and didn't notice any performance
> > > degradation, but I wasn't specifically measuring cq_poll overhead in a
> > > tight loop...
> > 
> > We were speaking about ib_req_notify_cq here, actually, not cq poll.
> > So what was tested?
> > 
> 
> Sorry, I meant req_notify.  I didn't specifically measure the cost of
> req_notify before and after this change.
> 
> I've been running the user mode perftest programs mainly.  

So, it's not really activated a lot there.
You want something like IPoIB BW test.

-- 
MST
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