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SubjectRe: 2.6.20-rc6 ramdisk problem
Thomas Gleixner wrote:
> On Wed, 2007-01-31 at 17:54 -0600, Robert Hancock wrote:
>> I'm not sure if there's an inherent max ramdisk size limit, however I
>> should point out that in most cases, using a tmpfs or ramfs file system
>> is better than old-style ramdisks. Those filesystems return unused
>> memory to the kernel (ramdisks statically allocate the entire space) and
>> also avoid the filesystem overhead of ramdisks (the files are mapped
>> into pagecache directly).
>
> This is not a question of what's better or not.
>
> Michal stepped into a real life problem:
>
> 1. ramdisk gets created in the first place w/o problems
> 2. formatting the same ramdisk succeeds
> 3. trying to use it fails
>
> So either #1 or #2 should have failed in the first place. Failing in #3
> is definitely a BUG in #1 or #2.
>
> How does your advise help to fix that BUG ? Ignoring it by using
> something else ?

Yes, there is likely a bug here of some sort. However, that doesn't
change the fact that ramdisks are sub-optimal for most uses.

--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/


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