Date: Thu, 25 Mar 2010 12:38:14 +0100 From: "Thomas Schmitt" <scdbackup@gmx.net> To: freebsd-hackers@freebsd.org Subject: Solved: How to slow down SATA to 1.5 GBit/s ? Message-ID: <105790671418047@192.168.2.69> In-Reply-To: <201003182017.o2IKHYE2042851@triton8.kn-bremen.de> References: <201003182017.o2IKHYE2042851@triton8.kn-bremen.de>
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Hi, i now have running the eSATA attached DVD drive with 150 MB/s on 8-STABLE and 8-RELEASE. Done by switching from ata to ahci as described by Juergen Lock in http://www.mail-archive.com/freebsd-hackers@freebsd.org/msg70510.html and the given link to Ivan Vora's http://ivoras.sharanet.org/blog/tree/2009-11-17.trying-ahci-in-8.0.html My thanks to both. The DVD drive at ahcich4 is curbed in /boot/device.hints by hint.ahcich.4.sata_rev="1" while the hard disk still runs on 300 MB/s. The problems with libburn and ahci have turned out as suboptimal usage of libcam flags which worked with ata and usb, but not with ahci. Thanks to Alexander Motin for telling me the right gestures of error reply detection. ------------------------------------------------ Little pitfall in Juergen's proposal: dumpfs /dev/adXsYa | sed -n ... produces output like /dev/ufsid/4ba77276 b4a8625 /dev/ufsid/4ba77276 fb8e9567 One has to fill in eventual leading 0s so that both hex numbers have 8 digits, and one has to remove the blank: /dev/ufsid/4ba772760b4a8625 /dev/ufsid/4ba77276fb8e9567 Alternatively one can follow Ivan's proposal to put into boot/loader.conf: kern.geom.label.debug=1 and to reboot for seeing the ufsid in the boot log. Have a nice day :) Thomas
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