Ric Wheeler writes: > Do you have any details on the test case that you ran that showed a > clear improvement? What kind of storage & IO pattern did you use? Is it possible to record latencytop output (like top batch mode) to capture the highest latency during a test run? Or how did you collect this: >my reproducer is sadly very simple (claws-mail is my mail client that uses maildir) >Process claws-mail (4896) Total: 2829.7 msec >EXT3: Waiting for journal access 2491.0 msec 88.4 % >Writing back inodes 160.9 msec 5.7 % >synchronous write 78.8 msec 3.0 % >is an example of such a trace (this is with patch, without patch the numbers are about 3x bigger) >Waiting for journal access is "journal_get_write_access" >Writing back inodes is "writeback_inodes" >synchronous write is "do_sync_write" -- solofo -- 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