From: Knut Petersen Date: Fri, 9 Sep 2005 20:04:59 +0000 (-0700) Subject: [PATCH] framebuffer: bit_putcs() optimization for 8x* fonts X-Git-Tag: v2.6.14-rc1~313 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c5eb5c1ea919f3f717236c5d0892f9c37f19de37;p=pandora-kernel.git [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed