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Eric Dumazet says: ==================== net: make dev_watchdog() less intrusive dev_watchdog() is used on many NIC to periodically monitor TX queues to detect hangs. Problem is : It stops all queues, then check them, then 'unfreeze' them. Not only this stops feeding the NIC, it also migrates all qdiscs to be serviced on the cpu calling netif_tx_unlock(), causing a potential latency artifact. With many TX queues, this is becoming more visible. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
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.