USB card reader problem

[Tony Baechler]

On 8/13/2015 1:52 PM, Colin Law wrote:
> That sounds as if it might be something to do with the way the writes
> are being buffered.  You said even when it appears to write fast that
> you then had to wait when unmounting, so likely the actual speed
> writing to the device is the same whether it appears to be fast or
> slow, but for some reason sometimes it is insisting on writing
> directly to the device rather than through buffers.

That's possible, but I don't think so.  I think the delay with unmounting 
has to do with the data being flushed before the kernel unmounts the device. 
  If I do even something like this:

df -h

there is a very long delay and that shouldn't involve writing at all.

>
> Please copy/paste the relevant contents of syslog when you plug in the
> card in the case where it turns out to be slow and the same when it is
> fast.  Then the first question is whether there is a difference.


I'm not able to get to that at the moment, so that will be sent separately.