Date: Sat, 30 Jul 2005 22:18:46 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Julian Elischer <julian@elischer.org> Cc: FreeBSD Current <freebsd-current@freebsd.org>, Brian Candler <B.Candler@pobox.com> Subject: Re: Apparent strange disk behaviour in 6.0 Message-ID: <5502.1122754726@phk.freebsd.dk> In-Reply-To: Your message of "Sat, 30 Jul 2005 12:47:36 PDT." <42EBD958.6040402@elischer.org>
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In message <42EBD958.6040402@elischer.org>, Julian Elischer writes: >> If you know your queue-theory, you also know why busy% is >> a pointless measurement: It represents the amount of time >> where the queue is non-empty. It doesn't say anything about >> how quickly the queue drains or fills. > >exactly.. I'm trying to work out why teh read and write queues are empty for so >much time in a transaction that SHOULD be disk bound.... I am very confident that the disk statistics collected in GEOM don't lie: your disks are idle because nobody submits I/O requests. Look at your scheduler... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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