Speed up DeviceKit device probing on really slow devices

Kay Sievers kay.sievers at vrfy.org
Wed Jan 20 04:53:48 PST 2010

On Tue, Jan 19, 2010 at 23:00, David Zeuthen <davidz at redhat.com> wrote:
> On Tue, 2010-01-19 at 11:41 -0800, Linus Torvalds wrote:
>> My wife has a embroidery machine that acts as a USB memory stick when
>> plugged into a computer through its USB port. It has a truly stunning
>> read  speed of 15kB/s (yes, really), and it turns out that both udev and
>> DeviceKit react very badly to devices that are slow, because they read
>> too much data off it.
> Thanks for the patch - I just applied it:
> http://cgit.freedesktop.org/DeviceKit/DeviceKit-disks/commit/?id=c8076f0095ce85b10b287e6c5d92f8b5520018f2
> As Kay said on the util-linux-ng list, the plan is to use blkid for this
> in the future - so at some point udisks-part-id will go away.
> Actually, I *think* the code is already in blkid for this - but IIRC a
> few details such as partition flags are still missing (see e.g.
> http://people.freedesktop.org/~david/gdu-edit-partition.png for how this
> information is used)

Yep, we are close to make all this happen now, and solve it properly
with all logic in one place, which is util-linux's blkid, which will
be used in all default udev installations. The current DeviceKit-disks
part should be obsolete before its next release.


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