linux-kernel - Re: responsiveness: newer kernels causing lagging and blocking

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Date:	Thu, 23 Feb 2012 17:31:24 +0000
From:	Dave Airlie <airlied@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	stephan.baerwolf@...ilmenau.de, linux-kernel@...r.kernel.org,
	Michael Buesch <mb@...sch.de>,
	Alex Deucher <alexdeucher@...il.com>,
	Dave Airlie <airlied@...hat.com>
Subject: Re: responsiveness: newer kernels causing lagging and blocking

On Thu, Feb 23, 2012 at 5:29 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Thu, Feb 23, 2012 at 9:21 AM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>>
>> One mystery that has never been resolved is just why wine causes a flood
>> of xrandr/connection probes, and then there is still the underlying issue
>> that probing blocks the device and causes noticeable latency.
>
> Is there any chance that the EDID code would just have a "if I probed
> in the last second or two, let's not do it again and instead just
> return the cached data from last time" thing to just protect against
> some odd interrupt flood (or a user that asks for edid information
> explicitly like xrandr).

X already does that, if you can the randr interfaces it doesn't cause
a probe unless you ask for it.

wine must be doing something silly or just needs to call a different interface.

Dave.
>
>                   Linus
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