How to slow down SATA to 1.5 GBit/s ?
Alexander Motin
mav at FreeBSD.org
Mon Mar 15 22:30:44 UTC 2010
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
More information about the freebsd-hackers
mailing list