Date: Tue, 16 Mar 2010 00:30:37 +0200 From: Alexander Motin <mav@FreeBSD.org> To: Juergen Lock <nox@jelal.kn-bremen.de> Cc: freebsd-hackers@freebsd.org, scdbackup@gmx.net Subject: Re: How to slow down SATA to 1.5 GBit/s ? Message-ID: <4B9EB50D.1000003@FreeBSD.org> In-Reply-To: <201003151950.o2FJonYP003759@triton8.kn-bremen.de> References: <201003141600.o2EG0F2M005027@triton8.kn-bremen.de> <201003151950.o2FJonYP003759@triton8.kn-bremen.de>
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Juergen Lock wrote: >> The speed setter in camcontrol seems not to work. >> Writing still gets stuck after a few MB. >> > Is this on 8.0 release or on stable/8 or head? As I said maybe that > part of the code wasn't in 8.0 yet... AFAIR it was implemented later then 8.0-RELEASE, and it works via: camcontrol negotiate cd0 -U -R 1500000 camcontrol reset 4 >> So i used the boot time option. >> dmesg tells: >> cd0 at ahcich4 bus 0 target 0 lun 0 >> cd0: <TSSTcorp CDDVDW SH-S223B SB02> Removable CD-ROM SCSI-0 device >> cd0: 300.000MB/s transfers >> >> I added to /boot/device.hints : >> hint.ahcich.4.sata_rev="1" >> >> After reboot, i see in dmesg: >> cd0 at ahcich4 bus 0 target 0 lun 0 >> cd0: <TSSTcorp CDDVDW SH-S223B SB02> Removable CD-ROM SCSI-0 device >> cd0: 150.000MB/s transfers That way is also working. -- Alexander Motin
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