FreeBSD src
34caa842a4
of CPUs present. On amd64 this unbreaks the boot for systems with 92 or more CPUs; the limit will vary on other systems depending on the size of their uma_zone and uma_cache structures. The major consumer of pages during UMA startup is the 19 zone structures which are set up before UMA has bootstrapped itself sufficiently to use the rest of the available memory: UMA Slabs, UMA Hash, 4 / 6 / 8 / 12 / 16 / 32 / 64 / 128 / 256 Bucket, vmem btag, VM OBJECT, RADIX NODE, MAP, KMAP ENTRY, MAP ENTRY, VMSPACE, and fakepg. If the zone structures occupy more than one page, they will not share pages and the number of pages currently needed for startup is 19 * pages_per_zone + N, where N is the number of pages used for allocating other structures; on amd64 N = 3 at present (2 pages are allocated for UMA Kegs, and one page for UMA Hash). This patch adds a new definition UMA_BOOT_PAGES_ZONES, currently set to 32, and if a zone structure does not fit into a single page sets boot_pages to UMA_BOOT_PAGES_ZONES * pages_per_zone instead of UMA_BOOT_PAGES (which remains at 64). Consequently this patch has no effect on systems where the zone structure fits into 2 or fewer pages (on amd64, 59 or fewer CPUs), but increases boot_pages sufficiently on systems where the large number of CPUs makes this structure larger. It seems safe to assume that systems with 60+ CPUs can afford to set aside an additional 128kB of memory per 32 CPUs. The vm.boot_pages tunable continues to override this computation, but is unlikely to be necessary in the future. Tested on: EC2 x1.32xlarge Relnotes: FreeBSD can now boot on 92+ CPU systems without requiring vm.boot_pages to be manually adjusted. Reviewed by: jeff, alc, adrian Approved by: re (kib) |
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| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| 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. See build(7) and 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. See build(7), config(8), and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information. 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 kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used. 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. 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. tests Regression tests which can be run by Kyua. See tests/README for additional information. 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