On Friday 23 January 2009, Stephen John Smoogen wrote: > On Tue, Jan 20, 2009 at 9:11 PM, Stephen John Smoogen <smooge@xxxxxxxxx> wrote: > > On Tue, Jan 20, 2009 at 6:33 PM, Jerry Geis <geisj@xxxxxxxxxxxxxxx> wrote: > >> Hi guys - I'm really looking forward to 5.3 for the potential of ext4. > >> I am moving/copying image files lately 8G file and it is slow. I am > >> hoping that ext4 really speeds that up. > > > > I don't think it will speed things up much. 8GB files are mostly > > hardware throughput and ext3/4 will actually be slower because the > > journalling etc are to make it more robust but at a speed cost. You > > would probably see better speed by going to ext2. > > I make it a habit of eating my own words if I screw up. If the results > seen on Ubuntu by one test hold up, it might have a large increase in > large writes In my experience write performance for different filesystems is very dependant on the type of hardware. I have raid controllers where the difference between Ext3 and XFS is ~20% and I have those where it is 120%... > (but nothing in large reads). Read (single thread seq.) is often limited by having a too low read ahead setting. "blockdev --setra 8192" can often push it up to bare metal speed for both Ext3 and XFS. It's important to note that this may not be very optimal for your typical I/O mix (non single thread, non seq.). /Peter
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