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Tobias Waldekranz says: ==================== net: dsa: mv88e6xxx: Improve indirect addressing performance The individual patches have all the details. This work was triggered by recent work on a platform that took 16s (sic) to load the mv88e6xxx module. The first patch gets rid of most of that time by replacing a very long delay with a tighter poll loop to wait for the busy bit to clear. The second patch shaves off some more time by avoiding redundant busy-bit-checks, saving 1 out of 4 MDIO operations for every register read/write in the optimal case. v1 -> v2: - Make sure that we always poll the busy bit at least twice, in the unlikely event that the first one is quick to query the hardware, but is then scheduled out for a long time before the timeout is checked. v2 -> v3: - Fallback to the longer sleeps after the initial two poll attempts. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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README
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.