On Wed, 24 Mar 2010, Dan Nelson wrote:
I had similar problems on a 32GB Solaris server at work. Note that with compression enabled, the entire system pauses while it compresses the outgoing block of data. It's just a fraction of a second, but long enough for end-users to complain about bad performance in X sessions. I had to throttle back to a 256MB write limit size to make the stuttering go away completely. It didn't affect write throughput much at all.
Apparently this was a kernel thread priority problem in Solaris. It is apparently fixed in recent versions of OpenSolaris. The fix required adding a scheduling class which allowed the kernel thread doing the compression to be less than the priority of normal user processes (such as the X11 server).
Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
