2013/9/16 Oliver Neukum <[email protected]> > On Mon, 2013-09-16 at 10:33 +0000, Morales, Alejandra wrote: > > 2013/9/9 Oliver Neukum <[email protected]> > > > > > > Your prime suspect is the detection of medium change which was > > > moved into the kernel in 3.2 or so. It can be disabled by sysfs. > > > Generally the notion that a certain task originates a read or write > > > on a block device is iffy. Read-ahead and shared data structures > > > make it impossible to accurately tell. > > > > > > USB storage devices are notorious for setting the removable bit > > > even if they have no removable medium. > > > > > > > Thanks for the answer Oliver. Unfortunately it doesn't seem to be the > > medium change detection what is causing these requests, since the > > removable bit is disabled and the polling period is set to -1:
> Interesting. Then you have no choice. Make a usbmon trace and look > at the SCSI commands going to the device. I made the usbmon and I could see a lot of scsi write commands, but no clue about where they were coming from. I did some testing on different computers and Linux distributions and it turned out that those requests were issued only on a desktop running Ubuntu. I followed this example: http://ubuntuforums.org/showthread.php?t=833301 and I could figure out that the requests were coming from a daemon called spindownd. After stopping it, they disappeared. Thanks for you help, Oliver. Regards, Alejandra -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
