On Wed, Mar 09, 2005 at 09:59:26PM +0000, Alan Cox wrote: > If you build 486 it will still use the TSC because it is available (The > PIT is buggy but the kernel knows about that anyway and handles it).
Hmm, I thought that was the whole point of the different cpu type choices in the kernel. Then again the MTRR is still available with a 386 kernel on a newer cpu as far as I remember, so I guess I will try a 486 optimized kernel next. > There are a few Geode tricks to know for performance > > - Turn off the video That is the plan long term, although the BIOS's serial console doesn't seem to work well with grub at least on minicom. I think switching to lilo may help that. > - If you can't turn it off use solid areas of colour to speed the system > up (The hardware uses RLE encoding to reduce ram fetch bandwidth) > - Remember the cache is only 16K (12K when running X11 as 4K is borrowed > for the blitter) Even more reason to keep the video off (I think it steals some system ram when on as well). > - The onboard audio is a software SB emulation on older GX. It burns > CPU. I have audio disabled since I have no need for it. > Also avoid touching various legacy registers as much as possible, many > cause BIOS traps in SMM emulation code. The list I have is NDA but you > can use rdtsc/inb or outb/rdtsc to work out which 8) Only PCI and LPC devices in use, so I don't think I will be poking any legacy registers directly, although I have no idea if the kernel would be poking any of them as part of running the drivers. Hopefully not. Thanks for the information. Len Sorensen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
