On Thu, 2008-05-01 at 21:07 +0530, Aneesh Kumar K.V wrote: > On Wed, Apr 30, 2008 at 07:58:35AM -0500, Eric Sandeen wrote: > > Aneesh Kumar K.V wrote: > > > With mballoc we search for the best extent using different > > > criteria. We should always use the goal group when we are > > > starting with a new criteria. > > > > Aneesh, is there any testcase etc that will demonstrate the resulting > > difference in layout? > > > > It's not clear to me from this changelog (without looking at a lot more > > context) exactly what you're changing and why... > > I don't have any specific test case. With mballoc depending on the > request size we follow different criteria to allocate blocks. For > example if the size is stripe size multiple we use criteria 1 and start > searching for the right blocks from block group starting with goal > group. If we don't find right count of blocks, we use criteria 2 and start > searching from the group block 0. I guess with criteria 2 also, we should start > searching from the goal group so that when we find the right count of > blocks we find them close to the goal group. > Sounds reasoanble to me. I added this patch in the ext4 patch queue > > -aneesh -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
