On Nov 15, 2007 23:02 -0800, Andrew Morton wrote: > So we have a section of blocks around the middle of the blockgroup which > are used for indirect blocks. > > Presmably it starts around 50% of the way into the blockgroup? > > An important question is: how does it stand up over time? Simply laying > files out a single time on a fresh fs is the easy case. But what happens > if that disk has been in continuous create/delete/truncate/append usage for > six months?
In the ext4-devel discussion, I asked about placement of the reserved blocks. Placement at the beginning of the group showed at worst marginally less performance and in some cases better performance. I suspect putting the reserved blocks at the beginning of the group would have a better long-term effect on performance because they are not in the middle of large contiguous allocations in the middle of the group. Cheers, Andreas -- Andreas Dilger Sr. Software Engineer, Lustre Group Sun Microsystems of Canada, Inc. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
