[Bug-ddrescue] Why doesn't ddrescue revert to full speed long after a bad read?

[Paul L Daniels]

Not sure if I'm missing something, but I've noticed that after a bad
read ddrescue never returns back to the full speed capability, however,
if I cancel the process and restart it (obviously with a log) it
immediately returns to full speed.

As an example, today I have a 2.5" drive that has bad sectors,
initially it reads 45MB/sec, then drops to below 1MB/sec
understandably, however beyond the bad sector, it only ever came back
to ~12MB/sec even though the last bad read was several GB ago.  Soon as
I halted the ddrescue and restarted it jumped back to 35~40GB
(obviously a slight slow down due to the natural speed variance across
the drive).

This behaviour has been seen on multiple versions of ddrescue and
multiple different drives and systems. Am I missing something obvious?


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