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DateSun, 05 Nov 2006 12:16:40 -0800
From"H. Peter Anvin" <>
SubjectRe: New filesystem for Linux
Maurizio Lombardi wrote:
> On 11/4/06, Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> wrote:
> 
>> free space is organized in lists of free runs
>> and converted to bitmap only in case of
>> extreme fragmentation.
> 
> There is a performance reason to prefer lists of free blocks rather than 
> bitmap?
> 
> I read from [Tanenbaum: Operating System, Design and Implementation II
> ed. ] that lists are better than bitmap only when disk is almost full.
> 

Yes, if you have a truly random access medium.

If you have media like physical disks, where fragmentation costs you, 
the lists will kill you dead in no time at all.

	-hpa
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