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OPNsense - FreeBSD source
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Right now processing a full 512 frame queue takes quite a while (measured on the order of milliseconds.) Because of this, the TX processing ends up sometimes preempting the taskqueue: * userland sends a frame * it goes in through net80211 and out to ath_start() * ath_start() will end up either direct dispatching or software queuing a frame. If TX had to wait for RX to finish, it would add quite a few ms of additional latency to the packet transmission. This in the past has caused issues with TCP throughput. Now, as part of my attempt to bring sanity to the TX/RX paths, the first step is to make the RX processing happen in smaller 'parts'. That way when TX is pushed into the ath taskqueue, there won't be so much latency in the way of things. The bigger scale change (which will come much later) is to actually process the frames in the ath_intr taskqueue but process _frames_ in the ath driver taskqueue. That would reduce the latency between processing and requeuing new descriptors. But that'll come later. The actual work: * Add ATH_RX_MAX at 128 (static for now); * break out of the processing loop if npkts reaches ATH_RX_MAX; * if we processed ATH_RX_MAX or more frames during the processing loop, immediately reschedule another RX taskqueue run. This will handle the further frames in the taskqueue. This should have very minimal impact on the general throughput case, unless the scheduler is being very very strange or the ath taskqueue ends up spending a lot of time on non-RX operations (such as TX completion.) |
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| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| ObsoleteFiles.inc | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree, the most commonly used one being ``world'', which rebuilds and installs everything in the FreeBSD system from the source tree except the kernel, the kernel-modules and the contents of /etc. The ``world'' target should only be used in cases where the source tree has not changed from the currently running version. See: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables. The ``buildkernel'' and ``installkernel'' targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process, documentation for which can be found at: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html And in the config(8) man page. Note: If you want to build and install the kernel with the ``buildkernel'' and ``installkernel'' targets, you might need to build world before. More information is available in the handbook. The sample kernel configuration files reside in the sys/<arch>/conf sub-directory (assuming that you've installed the kernel sources), the file named GENERIC being the one used to build your initial installation kernel. The file NOTES contains entries and documentation for all possible devices, not just those commonly used. It is the successor of the ancient LINT file, but in contrast to LINT, it is not buildable as a kernel but a pure reference and documentation file. Source Roadmap: --------------- bin System/user commands. cddl Various commands and libraries under the Common Development and Distribution License. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. rescue Build system for statically linked /rescue utilities. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html