[OpenAFS-devel] Patch to implement default tuning proposal discussed a while ago

[Niklas Edmundsson]

On Tue, 16 Aug 2005, chas williams - CONTRACTOR wrote:

> In message <20050816154428.C04501BAF3@citi.umich.edu>,Jim Rees writes:
>> I'm inclined to commit the new code and let Niklas or others work on making
>> it better for large caches later.  Comments?
>
> how about choosing the sqrt(cachesize/1024) as the "average file size"?
>
> 	cachesize	avg file size(k)	#files
>
> 	150M		~12			12500
> 	350M		~18			19444
> 	1G		~32			32768
> 	10G		~98			102040
> 	20G		~143			146653
>
> i choose sqrt() for no particular reason other than the numbers seems to
> more closly match the original sizes for smaller caches and for larger
> caches it matches the newly suggested average of 32k.  for huge caches
> it "safely" limits the amount of kernel space required.

Looks very good to me, since larger caches usually implies that you 
have larger files in orbit that you want to cache.

I'm all for doing it this way, it's dynamic and seems to give very 
sane numbers for extreme variations of cache size.

/Nikke
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  Niklas Edmundsson, Admin @ {acc,hpc2n}.umu.se     |    nikke@hpc2n.umu.se
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  I still miss my ex-wife - but my aim is improving!
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