Re: TSC and Cyrix
Brian Gerst (bgerst@quark.vpplus.com)
Tue, 10 Nov 1998 20:02:38 -0500
Kurt Garloff wrote:
>
> On Sun, Nov 08, 1998 at 02:42:03PM -0600, Trever Adams wrote:
> > Supposedly, in 2.1.127 it should output Mhz if the CPU supports TSC
> > (note that bogomips is pretty accurate to the Mhz with Cyrix chips, but
> > that is not what I am after). I have seen a tremendous speed up in all
> > apps (multitasking not just the foreground process) with 2.1.127, so I
> > assumed that the TSC code was active... now I found out it doesn't seem
> > to be.
>
> Why do you expect the TSC code to speed up your apps? It just makes the
> timing more accurate, if I didn't get anything completely wrong.
Because reading the TSC only takes a few cycles and doesn't involve ISA
port I/O, which is comparatively very slow.
--
Brian Gerst
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/