On Sun, 19 Jun 2011, Richard Elling wrote:
Yes. I've been looking at what the value of zfs_vdev_max_pending should be. The old value was 35 (a guess, but a really bad guess) and the new value is 10 (another guess, but a better guess). I observe that data from a fast, modern
I am still using 5 here. :-)
I haven't formed an opinion yet, but I'm inclined towards wanting overall better latency.
Most properly implemented systems are not running at maximum capacity and so decreased latency is definitely desirable so that applications obtain the best CPU usage and short-lived requests do not clog the system. Typical benchmark scenarios (max sustained or peak throughput) do not represent most real-world usage. The 60 or 80% solution (with assured reasonable response time) is definitely better than the 99% solution when it comes to user satisfaction.
Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
