Re: xsrc/58318: Slow/incremental updating of Firefox menu entries

[Rhialto <rhialto%falu.nl@localhost>]

The following reply was made to PR xsrc/58318; it has been noted by GNATS.

From: Rhialto <rhialto%falu.nl@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: Rhialto <rhialto%falu.nl@localhost>
Subject: Re: xsrc/58318: Slow/incremental updating of Firefox menu entries
Date: Tue, 11 Jun 2024 20:53:55 +0200

 I tried a crude hack with reducing "uncached" memory to "write combined"
 for a very un-precise set of cases: change pgprot_t ttm_io_prot(uint32_t
 caching_flags, pgprot_t tmp).
 
 However it didn't make any visible difference. I think that from this we
 can conclude that more subtle variations of a change here will not be a
 cure either.
 
 This was my change:
 
 --- usr/src/sys/external/bsd/drm2/dist/drm/ttm/ttm_bo_util.c.orig	2024-06-11 18:31:46.463037658 +0200
 +++ usr/src/sys/external/bsd/drm2/dist/drm/ttm/ttm_bo_util.c	2024-06-11 18:32:10.000825945 +0200
 @@ -606,7 +606,7 @@
  {
  	/* Cached mappings need no adjustment */
  	if (caching_flags & TTM_PL_FLAG_CACHED)
 -		return tmp;
 +		return tmp | PMAP_WRITE_COMBINE;
  
  #ifdef __NetBSD__
  	tmp &= ~PMAP_CACHE_MASK;