linux-kernel - Re: __i915_spin

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Message-ID: <56460E5C.6000602@kernel.dk>
Date:	Fri, 13 Nov 2015 09:22:52 -0700
From:	Jens Axboe <axboe@...nel.dk>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	DRI Development <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: __i915_spin_request() sucks

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

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