Date: Mon, 20 Jun 2005 19:57:27 -0700 From: eng@donut.ugcs.caltech.edu To: freebsd-performance@freebsd.org Subject: sustained sequential disk IO runs interactivity into the ground Message-ID: <20050621025727.GI24844@philemon.async.caltech.edu>
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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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