Alex actually pointed me the new mballoc patches at ftp://ftp.clusterfs.com/pub/people/alex/mballoc3 The series is the forward port of the same on top of d4ac2477fad0f2680e84ec12e387ce67682c5c13 (v2.6.23-rc2) I guess the mballoc3 patch at clusterfs.com is based on a patched ext3(I guess it is ext3 + extent tree local to clusterfs ? ). The following series is based on ext4. I tested the changes with different blocks per group combination and it seems to be working fine. (The last series did panic with mke2fs -g 800 ) I will now look at splitting this to smaller patches. NOTE : I am not sure whether patch 2 will be able to make the list. if not is there a place i can ftp/scp them so that others can access the same ? I haven't split the patches in any order and didn't bothered to write any meaningful commit messages since this is mostly work in progress. -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