Date: Sat, 21 Mar 2015 00:06:58 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: Mike Tancsa <mike@sentex.net>, John-Mark Gurney <jmg@funkthat.com> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>, John Baldwin <jhb@freebsd.org> Subject: Re: RELENG_10 performance regression (was Re: 35-40% performance drop releng9 vs releng10 openvpn Message-ID: <550CA812.8070509@quip.cz> In-Reply-To: <550C8AEE.4090408@sentex.net> References: <5506250A.2000506@sentex.net> <20150316132055.GQ32288@funkthat.com> <5509D6C6.4050204@sentex.net> <20150318211457.GL51048@funkthat.com> <550B6950.8060806@sentex.net> <550C5AAF.9060502@sentex.net> <550C8AEE.4090408@sentex.net>
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Mike Tancsa wrote on 03/20/2015 22:02: > OK, I think I found where the RELENG_10 performance loss happened. It seems > https://lists.freebsd.org/pipermail/svn-src-stable-10/2015-March/004778.html > > is the issue. > > Testing with a kernel from r279796 I get 76-77Mb of throughput. With > r279848 it drops to about 60Mb I am surprised by this huge performance drop. If it is really caused by this change (VFS timestamp precision from seconds to microseconds), wasn't this change tested before commit? Miroslav Lachman
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