On Thu, 23 Jan 2014, Linus Torvalds wrote: > Hmm. You're doing this for Matrix and now the aty driver. > > Maybe the problem is at the fbcon level? Depending on > FBINFO_READS_FAST to decide whether you should scroll or rewrite > sounds a bit silly: even if a device doesn't have fast reads, maybe it > has a fast accelerated BLIT operation and scrolls quickly. Should the > fbcon test perhaps be for FBINFO_READS_FAST _or_ the > FBINFO_HWACCEL_COPYAREA bits? Both mach64 and matrox have a hardware bitter that is faster than rewriting the console - that's why FBINFO_READS_FAST improves performance for them. One could improve generic framebuffer core to benchmark the performance of scrolling using blitter and rewrite and select FBINFO_READS_FAST automatically... Mikulas > I dunno. I didn't actually check the ->bcopy implementations, maybe > they don't use copyarea. So I'm just going by a general "this feels > wrong" feeling.. > > Linus > On Thu, Jan 23, 2014 at 10:18 AM, Mikulas Patocka <mpatocka@xxxxxxxxxx> wrote: > > Set FBINFO_READS_FAST so that the console code uses scrolling instead of > > rewriting. This improves scrolling speed. > -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
