[Intel-gfx] drm] Atomic update on pipe (A) took 119 us, max time under evasion is 100 us

[Jens Axboe]

On 05/04/2017 11:42 AM, Ville Syrjälä wrote:
> On Thu, May 04, 2017 at 09:26:09AM -0600, Jens Axboe wrote:
>> Hi,
>>
>> Running current -git on my laptop (20FB, X1 Carbon gen4, skylake), I get
>> a lot of the below warnings. Things seem to work fine (in fact it seems
>> faster in general use than previously), but it's a lot of warning spew.
>>
>> [  764.877978] [drm] Atomic update on pipe (A) took 156 us, max time under evasion is 100 us
> 
> I tried to optimize this a bit recently but indeed it's stil known to be too
> slow. Looks like all of that stuff did land in Linus's tree already,
> so presumably you have it all already.

Yes, this is Linus' tree...

> I did have some further ideas that should help but I got sidetracked by
> other things before I managed to finish the work. I guess I'll need to get
> back on that horse and try to finish what I started.
> 
> In the meantime, maybe we should just silence this error spew again
> until we're more confident about meeting the deadlines. Maarten?
> 
> Do you have lockdep enabled BTW? Based on what I've seen lockdep does
> seem be a major contributor to slowness here.

Nope, running a fairly optimized build on my laptop.

-- 
Jens Axboe