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Jedrzej Jagielski c7b97fcf1d ixgbe: reduce number of reads when getting OROM data 
[ Upstream commit 08a1af326a ]

Currently, during locating the CIVD section, the ixgbe driver loops
over the OROM area and at each iteration reads only OROM-datastruct-size
amount of data. This results in many small reads and is inefficient.

Optimize this by reading the entire OROM bank into memory once before
entering the loop. This significantly reduces the probing time.

Without this patch probing time may exceed over 25s, whereas with this
patch applied average time of probe is not greater than 5s.

without the patch:
[14:12:22] ixgbe: Copyright (c) 1999-2016 Intel Corporation.
[14:12:25] ixgbe 0000:21:00.0: Multiqueue Enabled: Rx Queue count = 63, Tx Queue count = 63 XDP Queue count = 0
[14:12:25] ixgbe 0000:21:00.0: 63.012 Gb/s available PCIe bandwidth (16.0 GT/s PCIe x4 link)
[14:12:26] ixgbe 0000:21:00.0: MAC: 7, PHY: 27, PBA No: N55484-001
[14:12:26] ixgbe 0000:21:00.0: 20:3a:43:09:3a:12
[14:12:26] ixgbe 0000:21:00.0: Intel(R) 10 Gigabit Network Connection
[14:12:50] ixgbe 0000:21:00.0 ens2f0np0: renamed from eth0

with the patch:
[14:18:18] ixgbe: Copyright (c) 1999-2016 Intel Corporation.
[14:18:19] ixgbe 0000:21:00.0: Multiqueue Enabled: Rx Queue count = 63, Tx Queue count = 63 XDP Queue count = 0
[14:18:19] ixgbe 0000:21:00.0: 63.012 Gb/s available PCIe bandwidth (16.0 GT/s PCIe x4 link)
[14:18:19] ixgbe 0000:21:00.0: MAC: 7, PHY: 27, PBA No: N55484-001
[14:18:19] ixgbe 0000:21:00.0: 20:3a:43:09:3a:12
[14:18:19] ixgbe 0000:21:00.0: Intel(R) 10 Gigabit Network Connection
[14:18:22] ixgbe 0000:21:00.0 ens2f0np0: renamed from eth0

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
Tested-by: Rinitha S <sx.rinitha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-11-13 15:37:12 -05:00
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README

README 

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.