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9a8648cce8
In ice_misc_intr_thread_fn(), if we do not complete all Tx timestamp work, the thread function will poll continuously forever. For E822 hardware, this wastes time as the return value from ice_ptp_process_ts() is accurate and always reports correctly that the PHY actually has new timestamp data. In addition, if we receive enough timestamps with the right pacing, we may never exit this polling. Should this occur, other tasks handled by the ice_misc_intr_thread_fn() will never be processed. Fix this by instead writing to PFINT_OICR, causing an emulated interrupt to be triggered immediately. This does take slightly more processing than just re-checking the timestamps. However, it allows all of the other interrupt causes a chance to be processed first in the hard IRQ function. Note that the OICR interrupt is configured to be throttled to no more than once every 124 microseconds. This gives an effective interrupt rate of ~8000 interrupts per second. This should thus not cause a significant increase in overall CPU usage when compared to sleeping. Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Tested-by: Arpana Arland <arpanax.arland@intel.com> (A Contingent worker at Intel) Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> |
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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.