Date: Fri, 13 Feb 2009 23:21:08 +0100 From: Ivan Voras <ivoras@freebsd.org> To: Scott Long <scottl@samsco.org> Cc: freebsd-current@freebsd.org, freebsd-stable@freebsd.org Subject: Re: HEADS UP: Major CAM performance regression Message-ID: <9bbcef730902131421r53efa13dq371658888747f387@mail.gmail.com> In-Reply-To: <4995DFE5.1020205@samsco.org> References: <499551B9.7050805@samsco.org> <gn3ssi$j1r$1@ger.gmane.org> <4995DFE5.1020205@samsco.org>
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2009/2/13 Scott Long <scottl@samsco.org>: > Ivan Voras wrote: >> >> Scott Long wrote: >> >>> I have committed a fix for this problem for FreeBSD 8-CURRENT as of SVN >>> revision 188570. FreeBSD 7-STABLE will be updated with the fix in a few >>> days once I've gotten confirmation that the fix works and doesn't cause >>> any adverse side-effects. Anyone wanting to help in this validation >>> effort should apply the attached patch to their kernel source tree and >>> recompile. Please contact me directly by email to report if the problem >>> is fixed for you. >> >> I notice that write performance on an ESXi 3.5 hosted system is doubled, >> but read performance remains the same (in bonnie++). >> On a CISS system there is no significant change. > > bonnie is an unreliable tool for measuring performance. I'll try your suggestion if you have one. (except if it's about bonnie++ primarily measuring sequential read/write - if a system can't do sequential IO well, it probably won't do random IO well)
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