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SubjectRe: [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes
[H. Peter Anvin - Wed, Nov 05, 2008 at 10:20:23AM -0800]
| Cyrill Gorcunov wrote:
| >
| > I see. Thanks! Btw Peter, I remember I read long time ago about
| > segment caches (well... in time of DOS programming actually). But
| > there was only 'common' words like this cache exist. But maybe
| > it's possible to know what exactly size of such a cache is?
| > You mentoined number 32. (heh... I hadn't remember it until
| > you mentoined about such a cache :-)
| >
|
| As with any other caching structure, you can discover its size,
| associativity, and replacement policy by artificially trying to provoke
| patterns that produce pathological timings.
|
| At Transmeta, at one time we used a 32-entry direct-mapped cache, which
| ended up with a ~96% hit rate on common Win95 benchmarks.
|
| I should, however, make it clear that there are other alternatives for
| speeding up segment descriptor loading, and not all of them rely on a cache.
|
| -hpa
|

Thanks a lot for explanation!

- Cyrill -


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