On Thu, 6 Aug 1998, Meelis Roos wrote:
> KG> * enable SUSP_HLT (reduce power; improves stability on most boards; use
> KG> boot option no_hlt on others)
>
> There were problems with suspen on halt discussed recently in linux-kernel.
> About gettimeofday and rdtsc. Have these been resolved by now?
> If not, you should not suspend on halt AFAIK.
The gettimeofday/rdtsc has been "fixed" by the sledgehammer approach. The
TSC is permanently disabled in Cx686MX's. The kernel will use the
slow_gettimeoffset function, since the current time code cannot handle the
(arguably broken) suspension of the TSC. The Jumbo patch is available to
fix this on 2.0.x (with many other goodies thrown in).
Still, enabling SUSP_HLT crashes a lot of old motherboards which can't
handle the power swings and is therefore unsafe for general usage. The
set6x86 utility is available to enable this and many other Cyrix speficic
options from userland. Please see the Cyrix/IBM HOWTO for more details,
http://gwyn.tux.org/~balsa/linux/cyrix/index.html
Cheers,
Rafael
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