[OpenAFS] Very large caches

[Derek Atkins]

I was never running with a cache that big.  I was running
a 3GB cache and it worked ok.  I never filled it nor did
I actually run any performance tests.

Recent versions of OpenAFS should support it relatively well.

-derek

Nickolai Zeldovich <kolya@MIT.EDU> writes:

> > ...  is it useful to have a, say, 18Gb client cache?
> 
> You might hit some performance problems in the dcache code with a
> cache that large.  There's a number of places where the dcache code
> does linear scans of all dcache entries, and you'll potentially have
> 1.8 million dcache entries in the kernel.  (You could probably cut
> that down to ~280k by having fewer dcache entries and assuming you'll
> cache mostly whole 64K chunks, but it's still quite a bit.)
> 
> It'd be interesting to see what particular performance problems you
> would infact hit with such a large cache, and fix them, but that's
> more in the long run..
> 
> -- kolya
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
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