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Tariq Toukan says: ==================== mlx5 PTM cross timestamping support This patchset by Rahul and Carolina adds PTM (Precision Time Measurement) support to the mlx5 driver. PTM is a PCI extended capability introduced by PCI-SIG for providing an accurate read of the device clock offset without being impacted by asymmetric bus transfer rates. The performance of PTM on ConnectX-7 was evaluated using both real-time (RTC) and free-running (FRC) clocks under traffic and no traffic conditions. Tests with phc2sys measured the maximum offset values at a 50Hz rate, with and without PTM. Results: 1. No traffic +-----+--------+--------+ | | No-PTM | PTM | +-----+--------+--------+ | FRC | 125 ns | <29 ns | +-----+--------+--------+ | RTC | 248 ns | <34 ns | +-----+--------+--------+ 2. With traffic +-----+--------+--------+ | | No-PTM | PTM | +-----+--------+--------+ | FRC | 254 ns | <40 ns | +-----+--------+--------+ | RTC | 255 ns | <45 ns | +-----+--------+--------+ v2: https://lore.kernel.org/d1dba3e1-2ecc-4fdf-a23b-7696c4bccf45@gmail.com ==================== Link: https://patch.msgid.link/20240730134055.1835261-1-tariqt@nvidia.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 reStructuredText 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.