mainlining shenanigans
adc8682ec6
The sqpoll thread can be used for performing the napi busy poll in a similar way that it does io polling for file systems supporting direct access bypassing the page cache. The other way that io_uring can be used for napi busy poll is by calling io_uring_enter() to get events. If the user specify a timeout value, it is distributed between polling and sleeping by using the systemwide setting /proc/sys/net/core/busy_poll. The changes have been tested with this program: https://github.com/lano1106/io_uring_udp_ping and the result is: Without sqpoll: NAPI busy loop disabled: rtt min/avg/max/mdev = 40.631/42.050/58.667/1.547 us NAPI busy loop enabled: rtt min/avg/max/mdev = 30.619/31.753/61.433/1.456 us With sqpoll: NAPI busy loop disabled: rtt min/avg/max/mdev = 42.087/44.438/59.508/1.533 us NAPI busy loop enabled: rtt min/avg/max/mdev = 35.779/37.347/52.201/0.924 us Co-developed-by: Hao Xu <haoxu@linux.alibaba.com> Signed-off-by: Hao Xu <haoxu@linux.alibaba.com> Signed-off-by: Olivier Langlois <olivier@trillion01.com> Link: https://lore.kernel.org/r/810bd9408ffc510ff08269e78dca9df4af0b9e4e.1646777484.git.olivier@trillion01.com Signed-off-by: Jens Axboe <axboe@kernel.dk> |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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 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.