freebsd with flexible iflib nic queues
36acfc6507
- In sched_pickcpu() be more careful taking previous CPU on SMT systems. Do it only if all other logical CPUs of that physical one are idle to avoid extra resource sharing. - In sched_pickcpu() change general logic of CPU selection. First look for idle CPU, sharing last level cache with previously used one, skipping SMT CPU groups. If none found, search all CPUs for the least loaded one, where the thread with its priority can run now. If none found, search just for the least loaded CPU. - Make cpu_search() compare lowest/highest CPU load when comparing CPU groups with equal load. That allows to differentiate 1+1 and 2+0 loads. - Make cpu_search() to prefer specified (previous) CPU or group if load is equal. This improves cache affinity for more complicated topologies. - Randomize CPU selection if above factors are equal. Previous code tend to prefer CPUs with lower IDs, causing unneeded collisions. - Rework periodic balancer in sched_balance_group(). With cpu_search() more intelligent now, make balansing process flat, removing recursion over the topology tree. That fixes double swap problem and makes load distribution more even and predictable. All together this gives 10-15% performance improvement in many tests on CPUs with SMT, such as Core i7, for number of threads is less then number of logical CPUs. In some tests it also gives positive effect to systems without SMT. Reviewed by: jeff Tested by: flo, hackers@ MFC after: 1 month Sponsored by: iXsystems, Inc. |
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| 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 | ||
| Makefile.mips | ||
| 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