Re: Huge console switching lags

From: James Simmons (jsimmons@transvirtual.com)
Date: Thu Oct 04 2001 - 11:49:49 EST


> > > > them. It draws pixel by pixel. Slow slow slow!!! I have developed a new
> ^^^^^^^^^^^^^^^^^^^^^^^
> Where does it draw pixel by pixel?

Okay. Let me say most drivers don't take advantage of the graphics hardware
to perform console operations. Instead they just draw directly to the
framebuffer which can be slow.

> Yep. Vesafb started as a nice gimmick to show that it's possible, and turned
> out to be a solution for yet another
> we-don't-release-specs-to-OS/FS-people company.

I know. Same with OFfb.

> Euh, most fbcon-* drivers already do this. Grep for fb_write in e.g.
> drivers/video/fbcon-cfb8.c and count the byte accesses (=> 0).

Yep. The new code I developed came out the merging of all the fbcon-cfb*
drivers.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Sun Oct 07 2001 - 21:00:32 EST