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
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