On 11-04-25 07:30 AM, Tejun Heo wrote: > On Mon, Apr 25, 2011 at 12:07:04PM +0100, Bruce Stenning wrote: >> Tejun, what does it mean to limit a sata link to UDMA/100? I thought that this >> was only for ata devices, and sata devices have the choice of 1.5Gbps, 3Gbps, >> or 6 Gbps. Is that a false assumption? Is it related to early sata devices that >> were still somewhat based on parallel ata designs? > > Yeap, devices behind SATA-PATA bridge were still affected by the > transfer mode so libata tries to slow them down too along with link > speed when limiting speed due to errors. Shouldn't affect native SATA > devices. Yeah, what he said. :) First generation SATA devices were merely PATA transports with a SATA-to-PATA converter chip onboard. Some of those require that we set the transfer modes. Ditto for various more modern setups, where CF-cards, PATA drives, and other weirdos are connected through a discrete SATA bridge device. Cheers -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
