Re: [squid-users] cache_dir ... plz help

That does not explain the number 416. If i take 2 * 13 * 256 * 256 this
equals 1703936 which is a far cry from 416

Henrik Nordstrom wrote:
>
> timo.dudziak@student.uni-siegen.de wrote:
>
> > cache_dir [ufs | asyncufs] dir MB L1 L2
> > perfect for ext2:
> > L2 := 256
> > L1 := ceil( MB / 416 )
> > so why / 416 ?
>
> Because someone simplified the calcuation for you by eleminating all
> constants.
>
> L2 = 256 (there is generally no reason to change this on
> ext2/ext3/ufs/whatever with a similar directory structure)
>
> L1 = ceil( MB * 1024 / (2 * average_object_size * L2 * L2))
>
> MB = size of the cache in MB
> 2 = a safety margin
> 1024 = conversion factor from MB to KB
> average_object_size = 13 KB (farily standard)
>
> For reiserfs there MAY be a slight benefit in increasing L2 somewhat,
> but not too much. There is only marginal differences in tuning this
> parameter.
>
> Regards
> Henrik Nordström
> Squid Hacker

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