CRAMFS or SQUASHFS

CRAMFS or SQUASHFS

[Robin Gilks]

Greetings

I've been trying to determine the best Flash based *_read-only_* compressed
filesystem for an embedded system.

I can find nothing about CRAMFS - not even what it stands for - is it CRAM as in
squeeze it all in or Compressed RAM meaning it uses loads of RAM to expand into.
Just a hint in the right direction here would help!!

For SQUASHFS, I'm unsure as to how mature it is and what its memory overhead is
since its using zlib - would the discussions about sharing zlib workspace be
relevant here as well?

Does anyone have a horror story particular to either of these technologies?

Many thanks...

--
Robin Gilks
Senior Design Engineer              Phone: (+64)(3) 357 1569
Tait Electronics                          Fax  :  (+64)(3) 359 4632
PO Box 1645 Christchurch        Email : robin.gilks@tait.co.nz
New Zealand


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Re: CRAMFS or SQUASHFS

[David Updegraff]

We ended up with squashfs since it gave better compression, better runtime
performance, and -- most importantly for us -- the 'mksquashfs' suite is
easy to compile up on non-Linux unixes, and it handles endiannes issues.

>
>
> Greetings
>
> I've been trying to determine the best Flash based *_read-only_* compressed
> filesystem for an embedded system.
>
> I can find nothing about CRAMFS - not even what it stands for - is it CRAM as in
> squeeze it all in or Compressed RAM meaning it uses loads of RAM to expand into.
> Just a hint in the right direction here would help!!
>
> For SQUASHFS, I'm unsure as to how mature it is and what its memory overhead is
> since its using zlib - would the discussions about sharing zlib workspace be
> relevant here as well?
>
> Does anyone have a horror story particular to either of these technologies?
>
> Many thanks...
>
> --
> Robin Gilks
> Senior Design Engineer              Phone: (+64)(3) 357 1569
> Tait Electronics                          Fax  :  (+64)(3) 359 4632
> PO Box 1645 Christchurch        Email : robin.gilks@tait.co.nz
> New Zealand
>
>
>


--
Dave Updegraff, Cray Inc. / dave@cray.com / 218-525-1154

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: CRAMFS or SQUASHFS

[Eugene Surovegin]

At 04:04 PM 6/3/2003, Robin Gilks wrote:
>I've been trying to determine the best Flash based *_read-only_* compressed
>filesystem for an embedded system.
>
>I can find nothing about CRAMFS - not even what it stands for - is it CRAM
>as in
>squeeze it all in or Compressed RAM meaning it uses loads of RAM to expand
>into.
>Just a hint in the right direction here would help!!

Did you read Documentation/filesystems/cramfs ??????

We use cramfs in one of our embedded products along with read-only MTD
block device.
No problems so far :)

BTW, patch exists that solves endianess problems in mkcramfs.

Eugene.


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