I have seen the error messages before, but not during these tests. diskd definitely seems to delay the time-till-crash by a lot - as I understand it the problems in diskd are crashes under high load, not that it slows it down right? Thanks for the help Dave -----Original Message----- From: redsnapper8t8@xxxxxxxxx [mailto:redsnapper8t8@xxxxxxxxx] On Behalf Of John Moylan Sent: Wednesday, November 14, 2007 12:39 PM To: Dave Raven Subject: Re: Squid Performance (with Polygraph) Doesn't diskd have a bug whereby it has issues under heavy load. http://www.squid-cache.org/bugs/show_bug.cgi?id=761 . If so, I am surprised that it is behaving best under heavy load. http://www.squid-cache.org/Versions/v2/2.6/squid-2.6.STABLE16-RELEASENOTES.html J