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Date: Sun, 17 Aug 2003 16:16:27 -0500
From: Dan Nelson <dnelson@allantgroup.com>
To: Pawel Jakub Dawidek <nick@garage.freebsd.pl>
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Subject: Re: GEOM Gate.
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In the last episode (Aug 17), Pawel Jakub Dawidek said:
> On Sat, Aug 16, 2003 at 08:50:30PM -0500, Dan Nelson wrote:
> +> What kind of hardware were you using?  2.5MB/sec NFS sounds
> +> abysmal.
> 
> I don't think it is a hardware problem.
> 
> Run this test on 5.1-CURRENT with:
> 
> options		INVARIANTS
> options		INVARIANT_SUPPORT
> options		WITNESS
> 
> and without any network and NFS optimization.

Yes, another test system (P5 MMX/233 laptop) drops its NFS throughput
from 4MB/sec to 2.5MB/sec when built with those flags.  So I'm assuming
you're doing these benchmarks on a comparable system?

I think this just demonstrates that you should not run benchmarks with
all your debugging flags enabled :)  Most people will not be running
production systems with WITNESS, and parts of the kernel that bog down
under the heavy load of WITNESS may work just fine on a regular kernal
config.

-- 
	Dan Nelson
	dnelson@allantgroup.com