2f16482202
With a blatant copy of some MIPS bits we introduce the crc32 and crc32c
hw accelerated module to LoongArch.
LoongArch has provided these instructions to calculate crc32 and crc32c:
* crc.w.b.w crcc.w.b.w
* crc.w.h.w crcc.w.h.w
* crc.w.w.w crcc.w.w.w
* crc.w.d.w crcc.w.d.w
So we can make use of these instructions to improve the performance of
calculation for crc32(c) checksums.
As can be seen from the following test results, crc32(c) instructions
can improve the performance by 58%.
Software implemention Hardware acceleration
Buffer size time cost (seconds) time cost (seconds) Accel.
100 KB 0.000845 0.000534 59.1%
1 MB 0.007758 0.004836 59.4%
10 MB 0.076593 0.047682 59.4%
100 MB 0.756734 0.479126 58.5%
1000 MB 7.563841 4.778266 58.5%
Signed-off-by: Min Zhou <zhoumin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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.