On Mon, Feb 20, 2023 at 11:31:23AM +0100, Antoine Jacoutot wrote:
> On Mon, Feb 20, 2023 at 02:06:34PM +1100, Jonathan Gray wrote:
> > On Sun, Feb 19, 2023 at 01:34:41PM +0100, Antoine Jacoutot wrote:
> > > Hi.
> > >
> > > There seems to be a regression with mesa that makes gtk+4 application
> > > very slow
> > > to start.
> > > By default the GSK renderer uses OpenGL.
> > > As a workaround, you can temporarily use this to go back to the cairo
> > > renderer
> > > which makes gtk+4 applications fast again:
> > >
> > > export GSK_RENDERER=cairo
> >
> > What hardware is this on? Is there a Mesa or gtk bug for it?
>
> See dmesg below.
>
> > When did this behaviour start? Before the gtk update that recently
> > went in? Does it occur with GSK_RENDERER=vulkan?
> > GSK_RENDERER described in
> > https://docs.gtk.org/gtk4/running.html#gsk_renderer
>
> It did not happen on my previous amd ryzen.
> As soon as I switched to the new intel laptop, I was that bug (exact same
> installation, I rsync'd everything).
>
> It does *not* appear with GSK_RENDERER=vulkan but that renderer is buggy (not
> built by default) and segfaults on a regular basis.
>
> > There is
> > https://gitlab.freedesktop.org/mesa/mesa/-/issues/5113
> > which briefly touches on shader cache. We disable the shader
> > cache to be able to uses pledge(2).
>
> Yes, that is the bug I was looking into.
Here is a xenocara diff to enable the shader cache.
It is created in ~/.cache/mesa_shader_cache/
On an Intel system (x250 with Broadwell) launching gtk4-demo results in
a 1.6M cache. The time to a window appearing is noticeably shorter
running it again after that.
The various firefox and chromium ports will need to change
unveil/pledge policies to use it. Chromium at least still runs but
there are multiple warnings that directories can't be created.
Index: lib/mesa/src/util/disk_cache.c
===================================================================
RCS file: /cvs/xenocara/lib/mesa/src/util/disk_cache.c,v
retrieving revision 1.13
diff -u -p -r1.13 disk_cache.c
--- lib/mesa/src/util/disk_cache.c 28 Jan 2023 08:56:53 -0000 1.13
+++ lib/mesa/src/util/disk_cache.c 20 Feb 2023 12:42:45 -0000
@@ -80,11 +80,6 @@ disk_cache_create(const char *gpu_name,
uint8_t cache_version = CACHE_VERSION;
size_t cv_size = sizeof(cache_version);
-#ifdef __OpenBSD__
- /* default to no disk shader cache to avoid pledge violations in chromium */
- return NULL;
-#endif
-
if (!disk_cache_enabled())
return NULL;
