Date: Fri, 24 Aug 2001 09:34:51 +0100 From: Konstantin Chuguev <Konstantin.Chuguev@dante.org.uk> To: Darryl Okahata <darrylo@soco.agilent.com> Cc: Alfred Perlstein <bright@mu.org>, freebsd-hackers@FreeBSD.ORG Subject: Re: secure Filesystem Message-ID: <3B8611AB.1C86DB23@dante.org.uk> References: <200108231726.KAA03359@mina.soco.agilent.com>
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That's cool! Maybe we can have a patch changing these cpp vars in the cfs
port?
Regards,
Konstantin.
Darryl Okahata wrote:
> However, upon perusing the code again, cfsd appears to be using a
> plain hash table with 1024 buckets and a linked list at each bucket.
> The number of buckets is controlled by two simple #define's in cfs.h:
>
> #define HSIZE 1024
> #define HMASK 0x3ff /* change these together, please */
>
> These are pretty easy to change (HSIZE must currently be a power of 2),
> and you generally don't have to worry about hash function issues (the
> file inode is used as the "hash function").
>
> My test case has 200000+ files, occupying ~1.4GB, and increasing
> the hash table size (number of buckets) to 1M (1024*1024) greatly
> improved swap performance (not surprising, as following the linked lists
> is what unnecessarily dragged in lots of pages). On my laptop with
> 128MB RAM, there was a significant change in resident memory footprint:
>
> VM used RES (max)
> original 1024 bucket cfsd: ? ?
> 128K bucket cfsd: 445MB 80-90MB
> 1024K bucket cfsd: 458MB 30-35MB (<20MB typ)
>
> Of course, increasing the number of buckets increased the initial
> cfsd size (to 14-16MB, in the case of the 1M buckets), but that's
> acceptable.
>
> [ And the cfsd process doesn't shrink when you cdetach .... ;-( ]
>
> --
> Darryl Okahata
> darrylo@soco.agilent.com
>
> DISCLAIMER: this message is the author's personal opinion and does not
> constitute the support, opinion, or policy of Agilent Technologies, or
> of the little green men that have been following him all day.
>
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--
* * Konstantin Chuguev Francis House
* * Application Engineer 112 Hills Road
* Tel: +44 1223 302992 Cambridge CB2 1PQ
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