Date: Wed, 12 Nov 2003 07:47:09 -0800 (PST)
From: <toposoph-space@yahoo.com>
To: freebsd-questions@freebsd.org
Subject: FYI: {CD,DVD}-ROM ATA mode, 5.1R
Message-ID: <20031112154709.60905.qmail@web12405.mail.yahoo.com>
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Hi, Just for information, may be it is already well known: I found that by default all ATA CD- and DVD-ROMS have PIO4 mode (at least on my machines, 5.1R). Changing mode to at least UDMA33 (atacontrol) improves performance dramatically - not just transfer speed increased, but (and this is more important) interrupt time reduced (according to systat -vmstat: from 40% to 0.8%). Regards, Sergey.
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