On Sat, 2011-04-02 at 17:00 -0400, William L. Thomson Jr. wrote: > On Sat, 2011-04-02 at 16:52 -0400, Patrick Martin wrote: > > I would think that the TRIM support for such devices would be be the > > main driver. Those devices store data more like SSD wouldn't they? > > I am not that familiar with TRIM, so I cannot comment really. Maybe who > are more experienced or knowledgeable can comment. That seems very > likely and probably though. Also from reading the wikipedia page on > TRIM[1] looks like ATA devices can have support for TRIM as well. > > Not sure it this helps with fragmentation or not. Seems to mostly be to > avoid overhead with rewrites and only writing data to free space. Which > SSD and flash mediums have more overhead on rewrite than write to empty > space. > > 1. http://en.wikipedia.org/wiki/TRIM
Looks like ext4 does have less fragmentation than ext2 or ext3. Also does better with large files. That said and keeping TRIM in mind. I think the more logical reason for the switch to ext4 vs yaffs is that yaffs is single threaded. Which is not good for multi-core machines or devices. Considering multi-core cellphones, tablets and other devices are likely just around the corner if not already hitting the street now, or sometime later this year. Thus there are several advantages to ext4 over yaffs. http://www.smartmobix.com/node/29 -- William L. Thomson Jr. Obsidian-Studios, Inc. http://www.obsidian-studios.com --------------------------------------------------------------------- Archive http://marc.info/?l=jaxlug-list&r=1&w=2 RSS Feed http://www.mail-archive.com/[email protected]/maillist.xml Unsubscribe [email protected]
