From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jens Axboe <axboe@kernel.dk>
Subject: Re: __i915_spin_request() sucks
Date: Fri, 13 Nov 2015 09:22:52 -0700
Message-ID: <56460E5C.6000602@kernel.dk>
References: <5644F850.2060803@kernel.dk> <5644F941.9090505@kernel.dk>
 <20151112221908.GA26194@nuc-i3427.alporthouse.com>
 <56451812.2050704@kernel.dk>
 <20151113091558.GN6247@nuc-i3427.alporthouse.com>
 <20151113153629.GB8939@kernel.dk> <1447431225.5655.66.camel@gmail.com>
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To: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>, Daniel Vetter <daniel.vetter@ffwll.ch>, DRI Development <dri-devel@lists.freedesktop.org>, LKML <linux-kernel@vger.kernel.org>
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On 11/13/2015 09:13 AM, Mike Galbraith wrote:
> On Fri, 2015-11-13 at 08:36 -0700, Jens Axboe wrote:
>> Previous patch was obvious pre-coffee crap, this should work for using
>> ktime to spin max 1usec.
>
> 1us seems a tad low.  I doubt the little wooden gears and pulleys of my
> core2 Toshiba Satellite lappy can get one loop ground out in a usec :)

Maybe it is, it's based off the original intent of the function, though. 
See the original commit referenced.

-- 
Jens Axboe