a1150a04b7
Tx queue cleanup happens in interrupt handler on same core as rx queue processing. Both can take considerable amount of processing in high packet-per-second scenarios. Sending big amounts of packets can stall the rx processing which is unfair and also can lead to out-of-memory condition since __dev_kfree_skb_irq queues the skbs for later kfree in softirq which is not allowed to happen with heavy load in interrupt handler. This puts tx cleanup in its own napi and enables threaded napi to allow the rx/tx queue processing to happen on different cores. The ability to sustain equal amounts of tx/rx traffic increased: from 280Kpps to 1130Kpps on Threadripper 3960X with upcoming Mikrotik 10/25G NIC, from 520Kpps to 850Kpps on Intel i3-3320 with Mikrotik RB44Ge adapter. Signed-off-by: Gatis Peisenieks <gatis@mikrotik.com> 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.