Date: Fri, 6 May 2005 15:12:04 -0500 From: Steve Ames <steve@energistic.com> To: Kris Kennaway <kris@obsecurity.org> Cc: current@freebsd.org Subject: Re: Benchmarking mpsafevfs with parallel tarball extraction Message-ID: <20050506201204.GA12764@energistic.com> In-Reply-To: <20050506183529.GA46411@xor.obsecurity.org> References: <20050506183529.GA46411@xor.obsecurity.org>
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On Fri, May 06, 2005 at 11:35:29AM -0700, Kris Kennaway wrote: > Kernel was built without INVARIANTS and other debugging options, > without ADAPTIVE_GIANT (which causes about a 200% performance penalty > on system time in my testing, and has marginal impact on real or user > time) and with 4BSD scheduler (ULE causes spontaneous reboots on this > machine). The e4500 uses the esp SCSI controller, which runs > without Giant. I'm rather suprised that ADAPTIVE_GIANT causes so much performance degradation in your testing. On my, admittedly much more modest system, using ADAPTIVE_GIANT shaves about 6 minutes off a 'make world'. Haven't really done any research on why that is. I was just suprised by your 200% performance penalty. -Steve
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