Frederik Deweerdt
26702b3439
commit6bd8614fc2upstream. When `skb_splice_from_iter` was introduced, it inadvertently added checksumming for AF_UNIX sockets. This resulted in significant slowdowns, for example when using sendfile over unix sockets. Using the test code in [1] in my test setup (2G single core qemu), the client receives a 1000M file in: - without the patch: 1482ms (+/- 36ms) - with the patch: 652.5ms (+/- 22.9ms) This commit addresses the issue by marking checksumming as unnecessary in `unix_stream_sendmsg` Cc: stable@vger.kernel.org Signed-off-by: Frederik Deweerdt <deweerdt.lkml@gmail.com> Fixes:2e910b9532("net: Add a function to splice pages into an skbuff for MSG_SPLICE_PAGES") Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Joe Damato <jdamato@fastly.com> Link: https://patch.msgid.link/Z1fMaHkRf8cfubuE@xiberoa Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.