On Wed, 24 Jun 2009, Lejun Zhu wrote:
There is a bug in the database about reads blocked by writes which may be related: http://bugs.opensolaris.org/view_bug.do?bug_id=6471212 The symptom is sometimes reducing queue depth makes read perform better.
This one certainly sounds promising. Since Matt Ahrens has been working on it for almost a year, it must be almost fixed by now. :-)
I am not sure how is queue depth is managed, but it seems possible to detect when reads are blocked by bulk writes and make some automatic adjustments to improve balance.
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
