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Date:      Sun, 11 Feb 2001 17:31:43 +1000
From:      Greg Black <gjb@gbch.net>
To:        Matt Dillon <dillon@earth.backplane.com>
Cc:        freebsd-hackers@FreeBSD.ORG
Subject:   soft updates performance
Message-ID:  <nospam-3a863fdf721615e@maxim.gbch.net>
In-Reply-To: <200102102245.f1AMj1328151@earth.backplane.com>  of Sat, 10 Feb 2001 14:45:01 PST
References:  <200102102245.f1AMj1328151@earth.backplane.com> 

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Matt Dillon wrote:

>     Unless you are doing a read-only mount, there are still going to be
>     cases where having softupdates turned on can be advantageous.  For
>     example, installworld will go a lot faster.  I also consider softupdates
>     a whole lot safer, even if all you are doing is editing an occassional
>     file.

OK, I'm sold on the general idea of using soft updates; but what
sort of performance improvements should I expect to see?

I do a kernel compile on a freshly-rebooted box with an without
softupdates; without, it took 20m45s and with soft updates it
still took 20m10s --- this is less than 3% faster, which is
close to statistically insignificant.  Is this expected, or is
there some other factor I should look at?

Greg


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