From: Gerd Hoffmann <kraxel@redhat.com> To: Pekka Paalanen <ppaalanen@gmail.com> Cc: Sven Schnelle <svens@stackframe.org>, dri-devel@lists.freedesktop.org, Helge Deller <deller@gmx.de>, linux-fbdev@vger.kernel.org, Thomas Zimmermann <tzimmermann@suse.de>, linux-kernel@vger.kernel.org Subject: Re: [PATCH] MAINTAINERS: Add Helge as fbdev maintainer Date: Tue, 18 Jan 2022 10:53:52 +0100 [thread overview] Message-ID: <20220118095352.xsb6fqacw4p276c5@sirius.home.kraxel.org> (raw) In-Reply-To: <20220118103323.4bae3a7d@eldfell> On Tue, Jan 18, 2022 at 10:33:23AM +0200, Pekka Paalanen wrote: > On Mon, 17 Jan 2022 19:47:39 +0100 > Sven Schnelle <svens@stackframe.org> wrote: > > > I also tested the speed on my Thinkpad X1 with Intel graphics, and there > > a dmesg with 919 lines one the text console took about 2s to display. In > > x11, i measure 22ms. This might be unfair because encoding might be > > different, but i cannot confirm the 'memcpy' is faster than hardware > > blitting' point. I think if that would be the case, no-one would care > > about 2D acceleration. > > I think that is an extremely unfair comparison, because a graphical > terminal app is not going to render every line of text streamed to it. > It probably renders only the final view alone if you simply run > 'dmesg', skipping the first 800-900 lines completely. Probably more like "render on every vblank", but yes, unlike fbcon it surely wouldn't render every single character sent to the terminal. Also acceleration on modern hardware is more like "compose window content using the 3d engine" than "use 2d blitter to scroll the window". > Maybe fbcon should do the same when presented with a flood of text, > but I don't know how or why it works like it works. fbcon could do the same, i.e. render to fbdev in a 60Hz timer instead of doing it synchronously. take care, Gerd
WARNING: multiple messages have this Message-ID (diff)
From: Gerd Hoffmann <kraxel@redhat.com> To: Pekka Paalanen <ppaalanen@gmail.com> Cc: linux-fbdev@vger.kernel.org, Helge Deller <deller@gmx.de>, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Thomas Zimmermann <tzimmermann@suse.de>, Sven Schnelle <svens@stackframe.org> Subject: Re: [PATCH] MAINTAINERS: Add Helge as fbdev maintainer Date: Tue, 18 Jan 2022 10:53:52 +0100 [thread overview] Message-ID: <20220118095352.xsb6fqacw4p276c5@sirius.home.kraxel.org> (raw) In-Reply-To: <20220118103323.4bae3a7d@eldfell> On Tue, Jan 18, 2022 at 10:33:23AM +0200, Pekka Paalanen wrote: > On Mon, 17 Jan 2022 19:47:39 +0100 > Sven Schnelle <svens@stackframe.org> wrote: > > > I also tested the speed on my Thinkpad X1 with Intel graphics, and there > > a dmesg with 919 lines one the text console took about 2s to display. In > > x11, i measure 22ms. This might be unfair because encoding might be > > different, but i cannot confirm the 'memcpy' is faster than hardware > > blitting' point. I think if that would be the case, no-one would care > > about 2D acceleration. > > I think that is an extremely unfair comparison, because a graphical > terminal app is not going to render every line of text streamed to it. > It probably renders only the final view alone if you simply run > 'dmesg', skipping the first 800-900 lines completely. Probably more like "render on every vblank", but yes, unlike fbcon it surely wouldn't render every single character sent to the terminal. Also acceleration on modern hardware is more like "compose window content using the 3d engine" than "use 2d blitter to scroll the window". > Maybe fbcon should do the same when presented with a flood of text, > but I don't know how or why it works like it works. fbcon could do the same, i.e. render to fbdev in a 60Hz timer instead of doing it synchronously. take care, Gerd
next prev parent reply other threads:[~2022-01-18 9:54 UTC|newest] Thread overview: 149+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-01-14 18:11 [PATCH] MAINTAINERS: Add Helge as fbdev maintainer Helge Deller 2022-01-14 18:31 ` Geert Uytterhoeven 2022-01-14 18:31 ` Geert Uytterhoeven 2022-01-17 9:48 ` Daniel Vetter 2022-01-17 9:48 ` Daniel Vetter 2022-01-17 10:02 ` Daniel Vetter 2022-01-17 10:02 ` Daniel Vetter 2022-01-17 10:19 ` Javier Martinez Canillas 2022-01-17 10:19 ` Javier Martinez Canillas 2022-01-17 10:49 ` Jani Nikula 2022-01-17 10:57 ` Helge Deller 2022-01-17 12:15 ` Helge Deller 2022-01-17 12:15 ` Helge Deller 2022-01-17 12:57 ` Gerd Hoffmann 2022-01-17 12:57 ` Gerd Hoffmann 2022-01-17 13:29 ` Geert Uytterhoeven 2022-01-17 13:29 ` Geert Uytterhoeven 2022-01-17 13:51 ` Thomas Zimmermann 2022-01-17 13:51 ` Thomas Zimmermann 2022-01-17 14:10 ` Geert Uytterhoeven 2022-01-17 14:10 ` Geert Uytterhoeven 2022-01-17 14:47 ` Helge Deller 2022-01-17 14:47 ` Helge Deller 2022-01-17 15:03 ` Daniel Vetter 2022-01-17 15:03 ` Daniel Vetter 2022-01-17 20:17 ` Helge Deller 2022-01-17 20:17 ` Helge Deller 2022-01-18 6:29 ` Gerd Hoffmann 2022-01-18 6:29 ` Gerd Hoffmann 2022-01-18 8:10 ` Geert Uytterhoeven 2022-01-18 8:10 ` Geert Uytterhoeven 2022-01-18 11:44 ` Daniel Vetter 2022-01-18 11:44 ` Daniel Vetter 2022-01-18 14:23 ` Thomas Zimmermann 2022-01-18 14:23 ` Thomas Zimmermann 2022-01-18 14:39 ` Simon Ser 2022-01-18 14:39 ` Simon Ser 2022-01-20 12:50 ` Gerd Hoffmann 2022-01-20 12:50 ` Gerd Hoffmann 2022-01-21 8:55 ` Daniel Vetter 2022-01-21 8:55 ` Daniel Vetter 2022-01-24 18:38 ` Geert Uytterhoeven 2022-01-24 18:38 ` Geert Uytterhoeven 2022-01-24 18:50 ` Daniel Vetter 2022-01-24 18:50 ` Daniel Vetter 2022-01-24 19:05 ` Thomas Zimmermann 2022-01-24 19:05 ` Thomas Zimmermann 2022-01-18 8:20 ` Helge Deller 2022-01-18 8:20 ` Helge Deller 2022-01-18 9:16 ` Gerd Hoffmann 2022-01-18 9:16 ` Gerd Hoffmann 2022-01-18 10:13 ` Helge Deller 2022-01-18 10:13 ` Helge Deller 2022-01-18 10:44 ` Helge Deller 2022-01-18 10:44 ` Helge Deller 2022-01-18 12:48 ` Gerd Hoffmann 2022-01-18 12:48 ` Gerd Hoffmann 2022-01-17 15:05 ` Thomas Zimmermann 2022-01-17 15:05 ` Thomas Zimmermann 2022-01-17 16:05 ` Helge Deller 2022-01-17 16:05 ` Helge Deller 2022-01-17 14:53 ` Thomas Zimmermann 2022-01-17 14:53 ` Thomas Zimmermann 2022-01-18 6:11 ` Gerd Hoffmann 2022-01-18 6:11 ` Gerd Hoffmann 2022-01-18 8:09 ` Helge Deller 2022-01-18 8:09 ` Helge Deller 2022-01-17 15:00 ` Daniel Vetter 2022-01-17 15:00 ` Daniel Vetter 2022-01-17 15:42 ` Helge Deller 2022-01-17 15:42 ` Helge Deller 2022-01-17 15:56 ` Daniel Vetter 2022-01-17 15:56 ` Daniel Vetter 2022-01-17 15:58 ` Thomas Zimmermann 2022-01-17 15:58 ` Thomas Zimmermann 2022-01-17 16:21 ` Helge Deller 2022-01-17 16:21 ` Helge Deller 2022-01-17 16:38 ` Daniel Vetter 2022-01-17 16:38 ` Daniel Vetter 2022-01-17 17:19 ` Helge Deller 2022-01-17 17:19 ` Helge Deller 2022-01-17 19:45 ` Helge Deller 2022-01-17 19:45 ` Helge Deller 2022-01-17 21:55 ` Ilia Mirkin 2022-01-17 21:55 ` Ilia Mirkin 2022-01-18 11:14 ` Daniel Vetter 2022-01-18 11:14 ` Daniel Vetter 2022-01-18 14:14 ` Thomas Zimmermann 2022-01-18 14:14 ` Thomas Zimmermann 2022-01-17 21:40 ` Jani Nikula 2022-01-17 21:40 ` Jani Nikula 2022-01-17 21:44 ` Helge Deller 2022-01-17 21:44 ` Helge Deller 2022-01-18 8:38 ` Jani Nikula 2022-01-18 8:38 ` Jani Nikula 2022-01-18 8:41 ` Geert Uytterhoeven 2022-01-18 8:41 ` Geert Uytterhoeven 2022-01-18 11:41 ` Daniel Vetter 2022-01-18 11:41 ` Daniel Vetter 2022-01-18 12:11 ` Simon Ser 2022-01-18 12:11 ` Simon Ser 2022-01-18 8:54 ` Helge Deller 2022-01-18 8:54 ` Helge Deller 2022-01-18 9:33 ` Javier Martinez Canillas 2022-01-18 9:33 ` Javier Martinez Canillas 2022-01-18 9:45 ` Geert Uytterhoeven 2022-01-18 9:45 ` Geert Uytterhoeven 2022-01-18 11:18 ` Daniel Vetter 2022-01-18 11:18 ` Daniel Vetter 2022-01-18 11:42 ` Helge Deller 2022-01-18 11:42 ` Helge Deller 2022-01-18 8:41 ` Helge Deller 2022-01-18 8:41 ` Helge Deller 2022-01-18 9:12 ` Helge Deller 2022-01-18 9:12 ` Helge Deller 2022-01-17 11:16 ` Thomas Zimmermann 2022-01-17 11:33 ` Helge Deller 2022-01-17 12:13 ` Thomas Zimmermann 2022-01-17 18:47 ` Sven Schnelle 2022-01-18 8:33 ` Pekka Paalanen 2022-01-18 8:33 ` Pekka Paalanen 2022-01-18 9:53 ` Gerd Hoffmann [this message] 2022-01-18 9:53 ` Gerd Hoffmann 2022-01-18 11:22 ` Daniel Vetter 2022-01-18 11:22 ` Daniel Vetter 2022-01-18 12:07 ` Gerd Hoffmann 2022-01-18 12:07 ` Gerd Hoffmann 2022-01-19 8:39 ` Pekka Paalanen 2022-01-19 8:39 ` Pekka Paalanen 2022-01-20 9:06 ` Geert Uytterhoeven 2022-01-20 9:06 ` Geert Uytterhoeven 2022-01-20 11:32 ` Daniel Vetter 2022-01-20 11:32 ` Daniel Vetter 2022-01-20 12:13 ` Geert Uytterhoeven 2022-01-20 12:13 ` Geert Uytterhoeven 2022-01-20 12:33 ` Daniel Vetter 2022-01-20 12:33 ` Daniel Vetter 2022-01-20 12:46 ` Geert Uytterhoeven 2022-01-20 12:46 ` Geert Uytterhoeven 2022-01-24 18:50 ` Geert Uytterhoeven 2022-01-24 18:50 ` Geert Uytterhoeven 2022-01-24 19:37 ` Daniel Vetter 2022-01-24 19:37 ` Daniel Vetter 2022-01-20 11:51 ` Gerd Hoffmann 2022-01-20 11:51 ` Gerd Hoffmann 2022-01-18 8:58 ` Michel Dänzer 2022-01-18 10:05 ` Sven Schnelle 2022-01-18 10:05 ` Sven Schnelle 2022-01-18 14:06 ` Thomas Zimmermann
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