fender0107401 发表于 2012-10-25 16:59
个人经验：最好别做。
fender0107401 发表于 2012-10-25 16:59
个人经验：最好别做。
fender0107401 发表于 2012-10-25 16:59
个人经验：最好别做。
meego2012 发表于 2012-10-25 17:04
版主之间来拆台了哈
fender0107401 发表于 2012-10-25 17:25
回复 6# meego2012
这说明你不会按。。。
meego2012 发表于 2012-10-25 20:42
版主说的对哈，我只是提个意见
我在linux下安装就很容易，直接apt-get就可以了
fender0107401 发表于 2012-10-26 08:20
你认为所有的linux都能apt-get install foo吗？
meego2012 发表于 2012-10-26 09:45
我用的ubuntu和Fedora是可以这样的，之前也试验过archlinux，也是可以这样的
我没有必要这这里撒谎啊 ...
fender0107401 发表于 2012-10-26 09:47
fedora和archlinux也移植了apt系统？
meego2012 发表于 2012-10-26 10:02
当然不是啊，他们是自己的包管理系统的啊，但是包依赖的关系解决的比较好，至少比FreeBSD的好
meego2012 发表于 2012-10-26 10:02
当然不是啊，他们是自己的包管理系统的啊，但是包依赖的关系解决的比较好，至少比FreeBSD的好
king_819 发表于 2012-10-27 15:36
回复 2# fender0107401
HZ和polling必用，网卡性能会更好；
fender0107401 发表于 2012-10-27 17:44
这个吗，感觉效果也不明显，比如说删除了内核里面的不使用驱动，那就能小一点，但是现在的内存都这么大 ...
mirnshi 发表于 2012-10-27 22:40
三、列举一些针对某项功能的优化参数。
可能会对磁盘，尤其大规模访问，做出不同的分配，大文件的块可能要大一些。小文件量很大，可能要降低块，提高inode. 所以一般数据盘都会安装后再创建文件系统，没必要安装时做。
lsstarboy 发表于 2012-10-27 23:25
回复 29# mirnshi
action08 发表于 2012-10-29 10:26
这是一个kernel编译性能优化的开门辞，来自centos
Are you sure? CentOS is designed to function as a ...
lsstarboy 发表于 2012-10-29 13:56
回复 40# action08
lsstarboy 发表于 2012-10-29 14:58
再说一个php的优化：
环境：
lsstarboy 发表于 2012-10-29 14:58
再说一个php的优化：
环境：
增加一些php-cgi进程数
meego2012 发表于 2012-10-29 13:36
不过有的时候真的需要定制一些内容，比如一些特定功能的机器，比如服务器上，那些无线的驱动啥的，音频 ...
mirnshi 发表于 2012-10-29 15:27
除非内核有缺陷，普通用户想搞瘫kernel基本没戏。
action08 发表于 2012-10-29 15:26
@mirnshi
lsstarboy 发表于 2012-10-29 16:21
回复 50# mirnshi
lsstarboy 发表于 2012-10-29 16:20
回复 53# mirnshi
# No zero mapping feature
# May break wine
# (There are also reports about broken samba3)
#security.bsd.map_at_zero=0
# Servers with threading software apache2 / Pound may want to rise following sysctl
#kern.threads.max_threads_per_proc=4096
# Max. backlog size
kern.ipc.somaxconn=4096
# Shared memory // 7.2+ can use shared memory > 2Gb
kern.ipc.shmmax=2147483648
# Sockets
kern.ipc.maxsockets=204800
# Mbuf 2k clusters (on amd64 7.2+ 25600 is default)
# Note that defaults for other variables depend on this variable, for example `tcpreass`
# Note for FreeBSD-7 and older: For such high value vm.kmem_size must be increased to 3G
kern.ipc.nmbclusters=262144
# Jumbo pagesize(_SC_PAGESIZE) clusters
# Used as general packet storage for jumbo frames on some network cards
# Can be monitored via `netstat -m`
#kern.ipc.nmbjumbop=262144
# Jumbo 9k/16k clusters
# If you are using them
#kern.ipc.nmbjumbo9=65536
#kern.ipc.nmbjumbo16=32768
# For lower latency you can decrease scheduler's maximum time slice
# default: stathz/10 (~ 13)
#kern.sched.slice=1
# Increase max command-line length showed in `ps` (e.g for Tomcat/Java)
# Default is PAGE_SIZE / 16 or 256 on x86
# This avoids commands to be presented as [executable] in `ps`
# For more info see: http://www.freebsd.org/cgi/query-pr.cgi?pr=120749
kern.ps_arg_cache_limit=4096
# Every socket is a file, so increase them
kern.maxfiles=204800
kern.maxfilesperproc=200000
kern.maxvnodes=200000
# On some systems HPET is almost 2 times faster than default ACPI-fast
# Useful on systems with lots of clock_gettime / gettimeofday calls
# See http://old.nabble.com/ACPI-fast-default-timecounter,-but-HPET-83--faster-td23248172.html
# After revision 222222 HPET became default: http://svnweb.freebsd.org/base?view=revision&revision=222222
kern.timecounter.hardware=HPET
# Small receive space, only usable on http-server, on file server this
# should be increased to 65535 or even more
#net.inet.tcp.recvspace=8192
# This is useful on Fat-Long-Pipes
#kern.ipc.maxsockbuf=10485760
#net.inet.tcp.recvbuf_max=10485760
#net.inet.tcp.recvbuf_inc=65535
# Small send space is useful for http servers that serve small files
# Autotuned since 7.x
net.inet.tcp.sendspace=16384
# This is useful on Fat-Long-Pipes
#net.inet.tcp.sendbuf_max=10485760
#net.inet.tcp.sendbuf_inc=65535
# Turn off receive autotuning
# You can play with it.
#net.inet.tcp.recvbuf_auto=0
#net.inet.tcp.sendbuf_auto=0
# This should be enabled if you going to use big spaces (>64k)
# Also timestamp field is useful when using syncookies
net.inet.tcp.rfc1323=1
# Turn this off on high-speed, lossless connections (LAN 1Gbit+)
net.inet.tcp.delayed_ack=0
# This feature is useful if you are serving data over modems, Gigabit Ethernet,
# or even high speed WAN links (or any other link with a high bandwidth delay product),
# especially if you are also using window scaling or have configured a large send window.
# Automatically disables on small RTT ( http://www.freebsd.org/cgi/cvswe ... cp_subr.c?#rev1.237 )
# This sysctl was removed in 10-CURRENT:
# See: http://www.mail-archive.com/svn- ... d.org/msg06178.html
#net.inet.tcp.inflight.enable=0
# TCP slowstart algorithm tunings
# Here we are assuming VERY uncongested network
# Only takes effect if net.inet.tcp.rfc3390 is set to 0
# Otherwise formula teken from http://tools.ietf.org/html/rfc3390
#net.inet.tcp.slowstart_flightsize=10
#net.inet.tcp.local_slowstart_flightsize=100
# Disable randomizing of ports to avoid false RST
# Before usage check SA here www.bsdcan.org/2006/papers/ImprovingTCPIP.pdf
# (it's also says that port randomization auto-disables at some conn.rates, but I didn't checked it thou)
#net.inet.ip.portrange.randomized=0
# Increase portrange
# For outgoing connections only. Good for seed-boxes and ftp servers.
net.inet.ip.portrange.first=1024
net.inet.ip.portrange.last=65535
#
# stops route cache degregation during a high-bandwidth flood
# http://www.freebsd.org/doc/en/bo ... curing-freebsd.html
#net.inet.ip.rtexpire=2
net.inet.ip.rtminexpire=2
net.inet.ip.rtmaxcache=1024
# Security
net.inet.ip.redirect=0
net.inet.ip.sourceroute=0
net.inet.ip.accept_sourceroute=0
net.inet.icmp.maskrepl=0
net.inet.icmp.log_redirect=0
net.inet.icmp.drop_redirect=1
net.inet.tcp.drop_synfin=1
#
# There is also good example of sysctl.conf with comments:
# http://www.thern.org/projects/sysctl.conf
#
# icmp may NOT rst, helpful for those pesky spoofed
# icmp/udp floods that end up taking up your outgoing
# bandwidth/ifqueue due to all that outgoing RST traffic.
#
#net.inet.tcp.icmp_may_rst=0
# Security
net.inet.udp.blackhole=1
net.inet.tcp.blackhole=2
# IPv6 Security
# For more info see http://www.fosslc.org/drupal/content/security-implications-ipv6
# Disable Node info replies
# To see this vulnerability in action run `ping6 -a sglAac ::1` or `ping6 -w ::1` on unprotected node
net.inet6.icmp6.nodeinfo=0
# Turn on IPv6 privacy extensions
# For more info see proposal http://unix.derkeiler.com/Mailin ... 08-06/msg00103.html
net.inet6.ip6.use_tempaddr=1
net.inet6.ip6.prefer_tempaddr=1
# Disable ICMP redirect
net.inet6.icmp6.rediraccept=0
# Disable acceptation of RA and auto linklocal generation if you don't use them
#net.inet6.ip6.accept_rtadv=0
#net.inet6.ip6.auto_linklocal=0
# Increases default TTL, sometimes useful
# Default is 64
net.inet.ip.ttl=128
# Lessen max segment life to conserve resources
# ACK waiting time in miliseconds
# (default: 30000. RFC from 1979 recommends 120000)
net.inet.tcp.msl=5000
# Max bumber of timewait sockets
net.inet.tcp.maxtcptw=200000
# Don't use tw on local connections
# As of 15 Apr 2009. Igor Sysoev says that nolocaltimewait has some buggy realization.
# So disable it or now till get fixed
#net.inet.tcp.nolocaltimewait=1
# FIN_WAIT_2 state fast recycle
net.inet.tcp.fast_finwait2_recycle=1
# Time before tcp keepalive probe is sent
# default is 2 hours (7200000)
#net.inet.tcp.keepidle=60000
# Should be increased until net.inet.ip.intr_queue_drops is zero
net.inet.ip.intr_queue_maxlen=4096
# Protocol decoding in interrupt thread.
# If you have NIC that automatically sets flow_id then it's better to not use direct_force, and use advantages of multithreaded netisr(9)
# If you have Yandex drives you better off with net.isr.direct_force=1 and net.inet.tcp.read_locking=0 otherwise you may run into some TCP related problems
# If you have old NIC that don't set flow_ids you may need to patch ip_input to manually set FLOW_ID via nh_m2flow
# FreeBSD 8+
#net.isr.direct=1
#net.isr.direct_force=1
# In FreeBSD 9+ it was renamed to
#net.isr.dispatch=direct
# This is for routers only
#net.inet.ip.forwarding=1
#net.inet.ip.fastforwarding=1
# This speed ups dummynet when channel isn't saturated
net.inet.ip.dummynet.io_fast=1
# Increase dummynet(4) hash
#net.inet.ip.dummynet.hash_size=2048
#net.inet.ip.dummynet.max_chain_len
# Should be increased when you have A LOT of files on server
# (Increase until vfs.ufs.dirhash_mem becomes lower)
vfs.ufs.dirhash_maxmem=67108864
# Note from commit http://svn.freebsd.org/base/head@211031 :
# For systems with RAID volumes and/or virtualization envirnments, where
# read performance is very important, increasing this sysctl tunable to 32
# or even more will demonstratively yield additional performance benefits.
vfs.read_max=32
# Explicit Congestion Notification (see http://en.wikipedia.org/wiki/Explicit_Congestion_Notification)
net.inet.tcp.ecn.enable=1
# Flowtable - flow caching mechanism
# Useful for routers
#net.inet.flowtable.enable=1
#net.inet.flowtable.nmbflows=65535
# IPFW dynamic rules and timeouts tuning
# Increase dyn_buckets till net.inet.ip.fw.curr_dyn_buckets is lower
net.inet.ip.fw.dyn_buckets=65536
net.inet.ip.fw.dyn_max=65536
net.inet.ip.fw.dyn_ack_lifetime=120
net.inet.ip.fw.dyn_syn_lifetime=10
net.inet.ip.fw.dyn_fin_lifetime=2
net.inet.ip.fw.dyn_short_lifetime=10
# Make packets pass firewall only once when using dummynet
# i.e. packets going thru pipe are passing out from firewall with accept
#net.inet.ip.fw.one_pass=1
# shm_use_phys Wires all shared pages, making them unswappable
# Use this to lessen Virtual Memory Manager's work when using Shared Mem.
# Useful for databases
#kern.ipc.shm_use_phys=1
# ZFS
# Enable prefetch. Useful for sequential load type i.e fileserver.
# FreeBSD sets vfs.zfs.prefetch_disable to 1 on any i386 systems and
# on any amd64 systems with less than 4GB of avaiable memory
# For additional info check this nabble thread http://old.nabble.com/Samba-read ... ing-td27964534.html
#vfs.zfs.prefetch_disable=0
# On highload servers you may notice following message in dmesg:
# "Approaching the limit on PV entries, consider increasing either the
# vm.pmap.shpgperproc or the vm.pmap.pv_entry_max tunable"
vm.pmap.shpgperproc=2048
# Accept filters for data, http and DNS requests
# Useful when your software uses select() instead of kevent/kqueue or when you under DDoS
# Note: DNS accf available on 8.0+
#accf_data_load="YES"
#accf_http_load="YES"
#accf_dns_load="YES"
# Async IO system calls
aio_load="YES"
# Linux specific devices in /dev
# As for 8.1 it only /dev/full
#lindev_load="YES"
# Adds NCQ support in FreeBSD
# WARNING! all ad[0-9]+ devices will be renamed to ada[0-9]+
# 8.0+ only
#ahci_load="YES"
#siis_load="YES"
# FreeBSD 9+
# New Congestion Control for FreeBSD
# http://caia.swin.edu.au/urp/newtcp/tools/cc_chd-readme-0.1.txt
# http://www.ietf.org/proceedings/78/slides/iccrg-5.pdf
# Initial merge commit message http://www.mail-archive.com/svn-src-all@freebsd.org/msg31410.html
#cc_chd_load="YES"
# Increase kernel memory size to 3G.
#
# Use ONLY if you have KVA_PAGES in kernel configuration, and you have more than 3G RAM
# Otherwise panic will happen on next reboot!
#
# It's required for high buffer sizes: kern.ipc.nmbjumbop, kern.ipc.nmbclusters, etc
# Useful on highload stateful firewalls, proxies or ZFS fileservers
# (FreeBSD 7.2+ amd64 users: Check that current value is lower!)
#vm.kmem_size="3G"
# If you have really busy forking webserver (i.e. apache13) you may run out of processes
#kern.maxproc=10000
# If your server has lots of swap (>4Gb) you should increase following value
# according to http://lists.freebsd.org/piperma ... October/029616.html
# Otherwise you'll be getting errors
# "kernel: swap zone exhausted, increase kern.maxswzone"
#kern.maxswzone="256M"
# Older versions of FreeBSD can't tune maxfiles on the fly
#kern.maxfiles="200000"
# Useful for databases
# Sets maximum data size to 1G
# (FreeBSD 7.2+ amd64 users: Check that current value is lower!)
#kern.maxdsiz="1G"
# Maximum buffer size(vfs.maxbufspace)
# You can check current one via vfs.bufspace
# Should be lowered/upped depending on server's load-type
# Usually decreased to preserve kmem
# (default is 10% of mem)
#kern.maxbcache="512M"
# Sendfile buffers
# For i386 only
#kern.ipc.nsfbufs=10240
# FreeBSD 9+
# HPET "legacy route" support. It should allow HPET to work per-CPU
# See http://www.mail-archive.com/svn- ... d.org/msg03603.html
#hint.atrtc.0.clock=0
#hint.attimer.0.clock=0
#hint.hpet.0.legacy_route=1
# syncache Hash table tuning
net.inet.tcp.syncache.hashsize=32768
net.inet.tcp.syncache.bucketlimit=32
net.inet.tcp.syncache.cachelimit=1048576
# Increased hostcache
# Later host cache can be viewed via net.inet.tcp.hostcache.list hidden sysctl
# Very useful for it's RTT RTTVAR
# Must be power of two
net.inet.tcp.hostcache.hashsize=65536
# hashsize * bucketlimit (which is 30 by default)
# It allocates 255Mb (1966080*136) of RAM
net.inet.tcp.hostcache.cachelimit=1966080
# TCP control-block Hash table tuning
# see http://serverfault.com/questions ... hashsize-in-freebsd
net.inet.tcp.tcbhashsize=524288
# Disable ipfw deny all
# Should be uncommented when there is a chance that
# kernel and ipfw binary may be out-of sync on next reboot
#net.inet.ip.fw.default_to_accept=1
#
# SIFTR (Statistical Information For TCP Research) is a kernel module that
# logs a range of statistics on active TCP connections to a log file.
# See prerelease notes http://groups.google.com/group/m ... ad/b4c18be6cdce76e4
# and man 4 sitfr
#siftr_load="YES"
# Enable superpages, for 7.2+ only
# See: http://lists.freebsd.org/piperma ... ovember/030094.html
vm.pmap.pg_ps_enabled=1
# Usefull if you are using Intel-Gigabit NIC
#hw.em.rxd=4096
#hw.em.txd=4096
#hw.em.rx_process_limit="-1"
# Also if you have ALOT interrupts on NIC - play with following parameters
# NOTE: You should set them for every NIC
#dev.em.0.rx_int_delay: 250
#dev.em.0.tx_int_delay: 250
#dev.em.0.rx_abs_int_delay: 250
#dev.em.0.tx_abs_int_delay: 250
# There is also multithreaded version of em/igb drivers that can be found here:
# http://people.yandex-team.ru/~wawa/
#
# for additional em monitoring and statistics use
# sysctl dev.em.0.stats=1 ; dmesg
# sysctl dev.em.0.debug=1 ; dmesg
# Also after r209242 (-CURRENT) there is a separate sysctl for each stat variable;
# Same tunings for igb
#hw.igb.rxd=4096
#hw.igb.txd=4096
#hw.igb.rx_process_limit=100
# Some useful netisr tunables. See sysctl net.isr
#net.isr.maxthreads=4
#net.isr.defaultqlimit=10240
#net.isr.maxqlimit=10240
# Bind netisr threads to CPUs
#net.isr.bindthreads=1
#
# FreeBSD 9.x+
# Increase interface send queue length
# See commit message http://svn.freebsd.org/viewvc/ba ... amp;revision=207554
#net.link.ifqmaxlen=1024
# Nicer boot logo =)
loader_logo="beastie"
Most of FreeBSD's limits can be monitored by
# vmstat -z
and
# limits
Variety of network counters can be monitored via
# netstat -s
In FreeBSD-8+ netstat's -Q option appeared, try following command to display netisr stats
# netstat -Q
For solving non-trivial TCP problems one can use net.inet.tcp.log_debug, it produces dmesg output similar to:
# man 7 tuning
我这边同样的硬件是FreeBSD最快，然后是Gentoo，最后是Debian。
action08 发表于 2012-10-29 17:50
回复 65# mirnshi
fallening_cu 发表于 2012-10-31 20:37
我这边机器上内存有 48G
而某个运行的程序瓶颈是硬盘上读写数据，于是把内存分了一块出来作为 tmpfs 挂载上 ...
归隐乡村 发表于 2012-10-31 16:45
为什么？会造成系统不稳定吗？回复 2# fender0107401
zhaopingzi 发表于 2012-11-02 15:34
优化？怎么优化，内核代码是别人写的。你改个参数就可以了吗？
zhaopingzi 发表于 2012-11-02 17:44
上次谁列举的开源7宗罪来这，这东西出问题找不到原厂支持
ruochen 发表于 2012-11-03 22:47
看了这个活动，可能下面说的有点跑题，当然很多东西可能是和Linux对比一下，以下有的话不专指FreeBSD
作为 ...
ruochen 发表于 2012-11-03 22:51
优化，总感觉是有一个基本优化+后续优化的策略
主要还是后续优化吧，根据应用的特点和监控数据，再逐步调整 ...
瀚海书香 发表于 2012-11-02 08:16
回复 1# iceblood
要是Fedora或者Suse优化，还有点东西；要是FreeBSD吗。。。，没用过
zhaopingzi 发表于 2012-11-02 17:44
上次谁列举的开源7宗罪来这，这东西出问题找不到原厂支持
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