[src/trunk]: src/sys/arch/x86/x86 x86/genfb: Re-enable shadowfb by defualt fo...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8515692dca6e
branches:  trunk
changeset: 370044:8515692dca6e
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Tue Sep 13 09:45:36 2022 +0000

description:
x86/genfb: Re-enable shadowfb by defualt for now.

Something makes radeondrmkmsfb, at at least, extremely slow, and it's
not yet clear what, and shadowfb=true fixes it.  I verified that the
framebuffer pages are correctly getting mapped write-combining, so
the page table entries aren't the problem -- not sure what is the
problem.

diffstat:

 sys/arch/x86/x86/genfb_machdep.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r fae356bd1663 -r 8515692dca6e sys/arch/x86/x86/genfb_machdep.c
--- a/sys/arch/x86/x86/genfb_machdep.c  Tue Sep 13 09:43:33 2022 +0000
+++ b/sys/arch/x86/x86/genfb_machdep.c  Tue Sep 13 09:45:36 2022 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: genfb_machdep.c,v 1.18 2022/08/14 23:09:30 riastradh Exp $ */
+/* $NetBSD: genfb_machdep.c,v 1.19 2022/09/13 09:45:36 riastradh Exp $ */
 
 /*-
  * Copyright (c) 2009 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: genfb_machdep.c,v 1.18 2022/08/14 23:09:30 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: genfb_machdep.c,v 1.19 2022/09/13 09:45:36 riastradh Exp $");
 
 #include <sys/param.h>
 #include <sys/conf.h>
@@ -59,7 +59,7 @@
 
 #if NWSDISPLAY > 0 && NGENFB > 0
 struct vcons_screen x86_genfb_console_screen;
-bool x86_genfb_use_shadowfb = false;
+bool x86_genfb_use_shadowfb = true;
 
 #if NACPICA > 0
 extern int acpi_md_vesa_modenum;