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| author |   Knut Petersen <Knut_Petersen@t-online.de> | 2005-09-09 13:04:59 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-09 13:58:02 -0700 |
| commit | c5eb5c1ea919f3f717236c5d0892f9c37f19de37 (patch) | |
| tree | 33e48218a7a49576120876a09ead5f1366576861 /mm/vmalloc.c | |
| parent | [PATCH] framebuffer: new driver for cyberblade/i1 graphics core (diff) | |
| download | linux-rng-c5eb5c1ea919f3f717236c5d0892f9c37f19de37.tar.xz linux-rng-c5eb5c1ea919f3f717236c5d0892f9c37f19de37.zip | |
[PATCH] framebuffer: bit_putcs() optimization for 8x* fonts
This trivial patch gives a performance boost to the framebuffer console
Constructing the bitmaps that are given to the bitblit functions of the
framebuffer drivers is time consuming. Here we avoide a call to the slow
fb_pad_aligned_buffer(). The patch replaces that call with a simple but
much more efficient bytewise copy.
The kernel spends a significant time at this place if you use 8x* fonts.
Every pixel displayed on your screen is prepared here.
Some benchmark results:
Displaying a file of 2000 lines with 160 characters each takes 889 ms
system time using cyblafb on my system (I´m using a 1280x1024 video mode,
resulting in a 160x64 character console)
Displaying the same file with the enclosed patch applied to 2.6.13 only
takes 760 ms system time, saving 129 ms or 14.5%.
Font widths other than 8 are not affected.
The advantage and correctness of this patch should be obvious.
Signed-off-by: Knut Petersen <Knut_Petersen@t-online.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/vmalloc.c')
0 files changed, 0 insertions, 0 deletions