486DLC Tuning
Peter Jeremy
PeterJeremy at optushome.com.au
Sat Oct 15 15:45:53 PDT 2005
On Sat, 2005-Oct-15 10:06:22 -0400, Joshua Coombs wrote:
>I have a 386 with a Cyrix 486DRx2-66 (clock doubled DLC) that I moved
>from 4.11 to 6.0. So far it's running decently, I've got more net/hd
>throughput than I had before, by a factor of two for net, but the box
>'feels' like I'm not getting the same cpu perf I had before. Without
>benchmarks, I'm not in the best position to prove it, but I figured
>I'd try some basic tuning to see if I could improve things.
I suspect your box would be happier running 4.x than 6.x
>machine i386
>cpu I386_CPU
>cpu I486_CPU
According to NOTES:
# I386_CPU is mutually exclusive with the other CPU types.
# I386_CPU is deprecated and will be removed in 6.0-RELEASE.
>It seems odd that I can have CYRIX_CACHE_REALLY_WORKS but not
>CYRIX_CACHE_WORKS enabled.
This code only functionally affects src/sys/i386/i386/initcpu.c (though
CYRIX_CACHE_REALLY_WORKS also disables a 'CPU cache:' message). There
has been no change in this code between 4-STABLE and 7-CURRENT.
All I can suggest is for you to study the code in conjunction with a
Cyrix system programming manual to understand what the effect of the
options is.
--
Peter Jeremy
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