[Bug 212183] st read statistics inaccurate when requested and physical block mismatch

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https://bugzilla.kernel.org/show_bug.cgi?id=212183

Étienne Mollier (etienne.mollier@cgg.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|5.3.1                       |5.3.1, 5.11.6

--- Comment #3 from Étienne Mollier (etienne.mollier@cgg.com) ---
Hi Kai,

Thanks for your comment about SILI, and the suggestion to factorize things a
bit.
Yes the correction is relevant when SILI is set, so we derived a bit from your
proposal to apply the residual correction only when SILI is set.  The patch is
in
attachment of the report.

We took that opportunity to try out Linux 5.11.6.  The patch applies
successfully
on this kernel version, and statistics reported by `tapestat` look much closer
to
the actual bandwidth of the tape.

Have a nice day,  :)
Étienne.

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