Date: Tue, 21 Jun 2005 14:07:20 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: <eng@donut.ugcs.caltech.edu>, <freebsd-performance@freebsd.org> Subject: Re: sustained sequential disk IO runs interactivity into the ground Message-ID: <00fe01c57662$2ac82700$b3db87d4@multiplay.co.uk> References: <20050621025727.GI24844@philemon.async.caltech.edu>
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Have you tried the vfs patch posted a few weeks ago?
Steve / K
----- Original Message -----
From: <eng@donut.ugcs.caltech.edu>
>I was doing a dd of dev/zero into a file on a UFS2 filesystem
> (softupdates disabled) on a clean 5.4-R system.
>
> an exec of top took approximately 30 seconds to complete
> and then revealed sys: 13% and idle: 87%
>
> quit, repeat five times, same delay, same numbers each time.
>
> FreeBSD 4.11 managed this with only a minor interactivity
> hit.
>
> What's going on here? Any ideas?
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