On Mon, Aug 02, 2010 at 04:02:32PM -0700, john stultz wrote: > >From these numbers, it looks like the atomic variables are a minor > improvement for -rt, but the improvement isn't as drastic as the earlier > j_state lock change, or the vfs scalability patchset. Thanks for doing this quick test run! I was expecting to see a more dramatic difference, since the j_state_lock patch removed one of the two global locks in jbd2_journal_stop, and the t_handle_lock patch removed the second of the two global locks. But I guess the j_state_lock contention in start_this_handle() is still the dominating factor. It's interesting that apparently the latest t_handle_lock patch doesn't seem to make much difference unless the VFS scalability patch is also applied. I'm not sure why that makes a difference, but it's nice to know that with the VFS scalability patch it does seem to help, even if it doesn't help as much as I had hoped. OK, I guess we'll have to start working on the more aggressive scalability fix ups.... - Ted -- 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
