[有奖讨论]FreeBSD性能的优化，您会怎么做？（获奖名单已公布-2012-12-5）

lsstarboy

回复 52# action08


    我还没有用持久连接，不了解效果。因为目前系统速度还可以，计划先折腾pdo，pdo折腾的差不多了再测试持久连接的效果。

zhengwei_zw

长连接会消耗mysql的资源。要看网站类型。比如论坛。就没有必要
如果是交易系统，可以用

action08

@lsstarboy
{:3_187:} {:3_188:}

mirnshi

lsstarboy 发表于 2012-10-29 16:21
回复 50# mirnshi

ipfw借用libalias做nat，由于libalias并不是特意跑内核的，所以能否高效的跑在内核，还是有待验证的。做nat是比较简单的事情，开发人员只是想更加省事而已，或者不想做大改动。

早期，ipfilter的效率要高过pf的，只是不知道现在pf进化得如何了。

mirnshi

lsstarboy 发表于 2012-10-29 16:20
回复 53# mirnshi

优化不能单一，而是要根据瓶颈来做的。你优化A后，B成了瓶颈，你再怎么调整A，都是无效果的了。

action08

回复 65# mirnshi


    看来你走得路不少，欢迎分享哦{:3_183:}

lsstarboy

终于找到印象最深的那个老外的文章了，从上面学习了很多东西，比网上疯传的那几个强多了，原来好像只到8，现在已经跟进到9了：

转部分，详情请参照原文：

sysctl.conf

# 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

loader.conf

# 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:

最后一句非常关键：

# man 7 tuning

原文：http://serverfault.com/questions ... -loader-conf-kernel

action08

回复 60# lsstarboy


    我没有做过具体的优化测试，但看到的很多优化经验都表示，

多进程数目一般接近等于cpu核心数或者为核心数的整数倍

action08

恭喜，你的测试水平达到业界主流水平，