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From: Martin Peres <martin.peres-Iz16wY1oaNPLSKGbIzaifA@public.gmane.org>
To: Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
	Ben Skeggs <bskeggs-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: "enable ctxprog xfer only when we need it to save power" introduces big performance regression
Date: Thu, 10 Nov 2011 08:10:44 +0100	[thread overview]
Message-ID: <4EBB78F4.2020902@ensi-bourges.fr> (raw)
In-Reply-To: <20111109221009.GD3402-OI9uyE9O0yo@public.gmane.org>

Le 09/11/2011 23:10, Marcin Slusarz a écrit :
> For anyone who don't read IRC logs - it turns out it regressed only on 
> my box, because I have page flipping disabled (due to page flipping 
> being very buggy here, see 
> https://bugs.freedesktop.org/show_bug.cgi?id=42398), which forces gpu 
> context switch on every frame - even with (OpenGL) full screen apps. 
> And this patch slows down context switches. So, can we disable xfers 
> in ctxprog only when page flipping is enabled? Or is there any other 
> option? Marcin 
Hmm, it isn't logical yet. To test for performance regression, I 
launched the well known context switch test that is glxgears and only 
found a performance decrease of 1%.

I'll test with pageflip disabled though and see for myself.

Anyway, we'll do something about it. I just hope that most cards don't 
have this problem. This is clearly an hw regression.

Martin

  parent reply	other threads:[~2011-11-10  7:10 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-29 17:08 "enable ctxprog xfer only when we need it to save power" introduces big performance regression Marcin Slusarz
     [not found] ` <20111029170801.GA3219-OI9uyE9O0yo@public.gmane.org>
2011-10-29 17:29   ` Marcin Slusarz
     [not found]     ` <20111029172923.GA3110-OI9uyE9O0yo@public.gmane.org>
2011-10-29 18:00       ` Maarten Maathuis
     [not found]         ` <CAGZ4FETt6QzMkxrMQwJsszjuQq0wdt85ujRZbxkdurkduaHh2A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-10-30  1:15           ` Ben Skeggs
2011-10-29 19:09       ` Marcin Slusarz
     [not found]         ` <20111029190938.GA3105-OI9uyE9O0yo@public.gmane.org>
2011-10-30  0:25           ` Maxim Levitsky
2011-10-30 10:33             ` Marcin Slusarz
     [not found]               ` <20111030103349.GA3157-OI9uyE9O0yo@public.gmane.org>
2011-10-30 10:37                 ` Marcin Kościelnicki
2011-11-09 22:10           ` Marcin Slusarz
     [not found]             ` <20111109221009.GD3402-OI9uyE9O0yo@public.gmane.org>
2011-11-10  7:10               ` Martin Peres [this message]
     [not found]                 ` <4EBB78F4.2020902-Iz16wY1oaNPLSKGbIzaifA@public.gmane.org>
2011-12-28 21:39                   ` Marcin Slusarz
     [not found]                     ` <20111228213902.GA4275-OI9uyE9O0yo@public.gmane.org>
2011-12-28 23:58                       ` Martin Peres
     [not found]                         ` <4EFBAD2B.8080207-Iz16wY1oaNPLSKGbIzaifA@public.gmane.org>
2011-12-29  1:38                           ` Marcin Slusarz
     [not found]                             ` <20111229013850.GA4076-OI9uyE9O0yo@public.gmane.org>
2012-01-13 21:26                               ` Martin Peres
     [not found]                                 ` <4F10A18E.1030908-GANU6spQydw@public.gmane.org>
2012-01-17 20:55                                   ` Lucas Stach
2012-01-17 21:17                                     ` Martin Peres

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