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d5a05e69ac
This driver uses a normal timer for TX coalescing, which means that the with the default tx-usecs of 1000 microseconds the cleanups actually happen 10 ms or more later with HZ=100. This leads to very low througput with TCP when bridged to a slow link such as a 4G modem. Fix this by using an hrtimer instead. On my ARM platform with HZ=100 and the default TX coalescing settings (tx-frames 25 tx-usecs 1000), with "tc qdisc add dev eth0 root netem delay 60ms 40ms rate 50Mbit" run on the server, netperf's TCP_STREAM improves from ~5.5 Mbps to ~100 Mbps. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Link: https://lore.kernel.org/r/20201120150208.6838-1-vincent.whitchurch@axis.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.