[FUG-BR] Valor aconselhavel para variável HZ

[Fabricio Lima]

Paulo,

seus numeros estão um pouco agressivos... 1milhao de arquivos abertos, e ao
mesmo tempo 32MB de buffers de rede.

Isso é um file server ou banco ou servidor de trafego de rede (router)?

observe q file server irá demandar muito arquivo aberto, ao contrario de
banco de dados.

Mas se for um servidor web, faz sentido muitos arquivos abertos, mas estou
ainda em duvida se tantos!

Acho que voce inflou em todos os sentidos, podendo ir so em uma direcao.


[ ]'s
Fabricio Lima
When your hammer is C++, everything begins to look like a thumb.

2014-11-05 15:58 GMT-02:00 Paulo Henrique - BSDs <paulo.rddck em bsd.com.br>:

> Saudações,
>
> Gostaria de saber se alguém trabalha com a variável HZ com o valor
> superior a 2000, caso sim o ambiente fica estável, há uma melhora no
> desempenho do sistema e da rede ?
> Sei que a mesma interfere quanto ao uso da bateria em portáteis contudo a
> duvida é restrita a servidores.
> Aumentar o valor da mesma em um servidor com 12 Cores / 24 Threads com
> 32Gbytes de ram melhorará o desempenho.
> Abaixo tem os dados do sistema atualmente.
> O HZ do sistema está em 2000.
>
> uname -a
> FreeBSD xxxxx 10.0-STABLE FreeBSD 10.0-STABLE #0 r269344: Thu Jul 31
> 14:39:46 BRT 2014
> netstat -m
> yyyyyyy em xxxxx:/usr/obj/usr/src/sys/XXXXXXXXXXX amd64
> 11204/15571/26775 mbufs in use (current/cache/total)
> 1023/9825/10848/2036062 mbuf clusters in use (current/cache/total/max)
> 1023/9512 mbuf+clusters out of packet secondary zone in use (current/cache)
> 0/548/548/1018031 4k (page size) jumbo clusters in use
> (current/cache/total/max)
> 0/0/0/301638 9k jumbo clusters in use (current/cache/total/max)
> 0/0/0/169671 16k jumbo clusters in use (current/cache/total/max)
> 4847K/25734K/30581K bytes allocated to network (current/cache/total)
> 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
> 0/0/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters)
> 0/0/0 requests for jumbo clusters delayed (4k/9k/16k)
> 0/0/0 requests for jumbo clusters denied (4k/9k/16k)
> 0 requests for sfbufs denied
> 0 requests for sfbufs delayed
> 9966280 requests for I/O initiated by sendfile
>
> uptime
> 15:47 up 86 days, 19:40, 1 user, load averages: 8,15 8,86 9,27
>
>
> Alguns tunnings que já foi feito no sistema.
>
> # $FreeBSD: stable/10/etc/sysctl.conf 112200 2003-03-13 18:43:50Z mux $
> #
> # This file is read when going to multi-user and its contents piped thru
> # ``sysctl'' to adjust kernel values. ``man 5 sysctl.conf'' for details.
> #
>
> # Uncomment this to prevent users from seeing information about processes
> that
> # are being run under another UID.
> #security.bsd.see_other_uids=0
>
> kern.maxfiles=1000000
>
> # Otimizacoes de rede.
> #kern.ipc.nmbclusters=131072 # 128Mb para buffer de rede - Ficou instavel
> valor definido pelo sistema.
> kern.ipc.maxsockbuf=33554432
> net.inet.tcp.sendbuf_max=33554432
> net.inet.tcp.recvbuf_max=33554432
> net.inet.tcp.sendspace=1048576 # default 65536
> net.inet.tcp.recvspace=1048576 # default 32768
> net.inet.tcp.sendbuf_inc=1048576 # 8192 default
> net.inet.tcp.recvbuf_inc=1048576 # 16384 default
> kern.ipc.somaxconn=4096 # 128 default
> net.inet.tcp.syncache.rexmtlimit=1
> net.inet.tcp.syncookies=1
>
> # COnfigura▒▒es de Seguran▒a
> # General Security and DoS mitigation.
> net.inet.ip.check_interface=1 # verify packet arrives on correct interface
> net.inet.ip.portrange.randomized=1 # randomize outgoing upper ports
> net.inet.ip.process_options=0 # IP options in the incoming packets will be
> ignored
> net.inet.ip.random_id=1 # assign a random IP_ID to each packet leaving the
> system
> net.inet.ip.redirect=0 # do not send IP redirects
> net.inet.ip.accept_sourceroute=0 # drop source routed packets since they
> can not be trusted
> net.inet.ip.sourceroute=0 # if source routed packets are accepted the
> route data is ignored
> #net.inet.ip.stealth=1 # do not reduce the TTL by one(1) when a packets
> goes through the firewall
> net.inet.icmp.bmcastecho=0 # do not respond to ICMP packets sent to IP
> broadcast addresses
> net.inet.icmp.maskfake=0 # do not fake reply to ICMP Address Mask Request
> packets
> net.inet.icmp.maskrepl=0 # replies are not sent for ICMP address mask
> requests
> net.inet.icmp.log_redirect=0 # do not log redirected ICMP packet attempts
> net.inet.icmp.drop_redirect=1 # no redirected ICMP packets
> #net.inet.icmp.icmplim=50 # 50 ICMP packets per second. a reasonable
> number for a small office.
> #net.inet.tcp.delayed_ack=1 # always employ delayed ack, 6 packets get 1
> ack to increase bandwidth
> net.inet.tcp.drop_synfin=1 # SYN/FIN packets get dropped on initial
> connection
> net.inet.tcp.ecn.enable=1 # explicit congestion notification (ecn)
> warning: some ISP routers abuse it
> net.inet.tcp.fast_finwait2_recycle=1 # recycle FIN/WAIT states quickly
> (helps against DoS, but may cause false RST)
> net.inet.tcp.icmp_may_rst=0 # icmp may not send RST to avoid spoofed
> icmp/udp floods
> net.inet.tcp.maxtcptw=15000 # max number of tcp time_wait states for
> closing connections
> net.inet.tcp.msl=5000 # 5 second maximum segment life waiting for an ACK
> in reply to a SYN-ACK or FIN-ACK
> net.inet.tcp.path_mtu_discovery=0 # disable MTU discovery since most ICMP
> packets are dropped by others
> net.inet.tcp.rfc3042=0 # disable the limited transmit mechanism which can
> slow burst transmissions
> #net.inet.tcp.sack.enable=1 # sack disabled? http://www.ibm.com/
> developerworks/linux/library/l-tcp-sack/index.html
> net.inet.udp.blackhole=1 # drop udp packets destined for closed sockets
> net.inet.tcp.blackhole=2 # drop tcp packets destined for closed ports
> #net.route.netisr_maxqlen=4096 # route queue length defaults 4096 (rtsock
> using "netstat -Q")
> security.bsd.see_other_uids=0 # hide processes for root from user uid's
>
> ## Configuracoes de envio
>
> net.local.stream.sendspace=164240
> net.local.stream.recvspace=164240
>
> ## Configuracoes contra spoof
>
> net.inet.ip.rtexpire=60 # 3600 secs
> net.inet.ip.rtminexpire=2 # 10 secs
> net.inet.ip.rtmaxcache=1024 # 128 entries
>
> Qualquer orientação é bem vinda.
>
> Att.
>
> --
> Paulo Henrique.
> Grupo de Usuários de Sistemas BSDs no Brasil.
> Fone: +55 21 96713-5042
>
> Não importa o que faça, sempre haverá alguém em algum lugar do mundo que
> será sempre melhor do que você.
>
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