[FUG-BR] Valor aconselhavel para variável HZ

[Fabricio Lima]

Edinilson, vc está certo...
eu tb mexia mais nisso na epoca do 6, 7, 8..

Hj eles ajustaram tanta coisa (9 e 10)
q talvez o default seja melhor q um 7 tunado...

(minha documentaçao caducou)

testar, testar, testar...

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

2014-11-05 16:44 GMT-02:00 Edinilson - ATINET <edinilson em atinet.com.br>:

> ----- Original Message ----- From: "Paulo Henrique - BSDs" <
>> paulo.rddck em bsd.com.br>
>> To: ""Lista Brasileira de Discussão sobre FreeBSD (FUG-BR)"" <
>> freebsd em fug.com.br>
>> Sent: Wednesday, November 05, 2014 3:58 PM
>> Subject: [FUG-BR] Valor aconselhavel para variável HZ
>>
>> 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.
>>
>>
> Ate o FreeBSD 7 eu ate que me preocupava em ficar mexendo no hz. Apos
> isto, e com estas interfaces de rede modernas da Intel, nao me preocupo
> mais (nem com hz nem com polling) pois PARECE nao mudar muito coisa.
>
> Veja uma discussao de 2005 sobre o hz onde ja se discutia isto:
> http://lists.freebsd.org/pipermail/freebsd-questions/
> 2005-April/083482.html
>
> e veja tambem este link, na parte onde esta o hz o que ele diz:
> https://calomel.org/freebsd_network_tuning.html
>
>
> Edinilson
> ------------------------------------------
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>
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