atom feed3 messages in org.freebsd.freebsd-performancesustained sequential disk IO runs int...
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en...@donut.ugcs.caltech.eduJun 21, 2005 12:52 pm 
Steven HartlandJun 21, 2005 1:08 pm 
Mike TancsaJun 21, 2005 1:41 pm 
Subject:sustained sequential disk IO runs interactivity into the ground
From:Steven Hartland (kill@multiplay.co.uk)
Date:Jun 21, 2005 1:08:04 pm
List:org.freebsd.freebsd-performance

Have you tried the vfs patch posted a few weeks ago?

Steve / K

----- Original Message ----- From: <en@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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