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Date:      Mon, 14 Oct 2013 18:35:49 +0200
From:      Carlos Jacobo Puga Medina <cjpugmed@gmail.com>
To:        freebsd-questions@freebsd.org
Subject:   Tuning /etc/sysctl.conf
Message-ID:  <CAHHLbRMzNtGWAg1DGh405d5BVzORMDE-qC9qts+xzbUmAWtgew@mail.gmail.com>

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Hi people,

I'm very interested to tuning /etc/sysctl.conf according to the
specifications of my PC. I've been reading some guides [1], tutorials
[2-3], Q&A [4] and the FreeBSD Handbook's related section 12.12 Tuning with
sysctl(8), but I think it's much more convenient if I contrast it with
other examples or experienced users.

Here is my relevant info outputs for help to improve the sysctl(8)
variables.

 % uname -a
FreeBSD freebsd 9.2-RELEASE FreeBSD 9.2-RELEASE #0 r255898: Fri Sep 27
03:52:52 UTC 2013     root@bake.isc.freebsd.org:/usr/obj/usr/src/sys/GENERIC
 i386

 % dmesg | grep CPU
CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz (2394.06-MHz 686-class CPU)
cpu0: <ACPI CPU> on acpi0
p4tcc0: <CPU Frequency Thermal Control> on cpu0

 % dmesg | grep memory
real memory  = 2147483648 (2048 MB)
avail memory = 2082701312 (1986 MB)

 % pciconf -lvv | grep -n2 Ethernet
41-sis0@pci0:0:4:0: class=0x020000 card=0x80a71043 chip=0x09001039 rev=0x91
hdr=0x00
42-    vendor     = 'Silicon Integrated Systems [SiS]'
43:    device     = 'SiS900 PCI Fast Ethernet'
44-    class      = network
45-    subclass   = ethernet

My /etc/sysctl.conf

# $FreeBSD: release/9.2.0/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
vfs.usermount=1
hw.snd.default_unit=2
kern.ipc.maxsockbuf=16777216
kern.ipc.nmbclusters=32768
kern.ipc.shm_allow_removed=1
kern.ipc.somaxconn=8192
kern.maxfiles=65536
kern.maxfilesperproc=32768
net.inet.tcp.blackhole=2
net.inet.tcp.delayed_ack=0
net.inet.tcp.path_mtu_discovery=0
net.inet.tcp.recvbuf_auto=1
net.inet.tcp.recvbuf_inc=16384
net.inet.tcp.recvbuf_max=16777216
net.inet.tcp.recvspace=65536
net.inet.tcp.rfc1323=1
net.inet.tcp.sendbuf_auto=1
net.inet.tcp.sendbuf_inc=8192
net.inet.tcp.sendspace=65536
net.inet.udp.blackhole=1
net.inet.udp.maxdgram=57344
net.inet.udp.recvspace=65536
net.local.stream.recvspace=65536
net.local.stream.sendspace=65536
net.inet.tcp.sendbuf_max=16777216
net.inet.ip.random_id=1
http://serverfault.com/questions/64356/freebsd-performance-tuning-sysctls-loader-conf-kernel
# Allow for up 2 GB of wired memory.
vm.max_wired=524288

I will appreciate any input about the subject.
--CJPM

[1] http://harryd71.blogspot.com.es/2008/10/tuning-freenas-zfs.html
[2] https://wiki.freebsd.org/SystemTuning#SYSCTL_TUNING
[3] https://wiki.freebsd.org/NetworkPerformanceTuning
[4]
http://serverfault.com/questions/64356/freebsd-performance-tuning-sysctls-loader-conf-kernel



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