On Sun, Dec 21, 2014 at 02:44:20PM -0800, Kenneth R. Crudup wrote: > > I had issues with my Samsung 4GB disk recently in Linus' master tree kernels, > > and have bisected it to the above commit. When doing running bonnie++ (etc. > > I get EIOs. > > Is there a "quirks" available for this option so I may special-case this > > particular disk? On Tue, 23 Dec 2014, Christoph Hellwig wrote: > Looks like we need to quirk it. Can you try to echo different limits > to the /sys/block/sdc/queue/max_hw_sectors_kb file for the device to > find the limit for it? Looks like it's 32767; making it an even 32K sectors starts the EIOs again. To recap for the various lists: Vendor: Samsung Model: D3 Station Rev: 0202 Type: Direct-Access ANSI SCSI revision: 06 It's the 4TB model: /sys/block/sdc/size:7814037160 /sys/block/sdc/queue/max_hw_sectors_kb:61440 Works OK if I echo 32767 > /sys/block/sdc/queue/max_sectors_kb Has anyone seen a disk out there that's got a (properly-supported) "max_hw_sectors_kb" >= 32K? If not, maybe we should clamp that value to prevent other misreporting(?) disks? -Kenny -- Kenneth R. Crudup Sr. SW Engineer, Scott County Consulting, Silicon Valley -- 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
