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Old 06-28-2011, 05:51 AM   #1
Registered: Dec 2008
Location: Germany/Poland
Distribution: CentOS / Debian / Solaris / RedHat
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Question Linux tuning with sysctl.conf

Hello Gurus,

does anybody have experience with linux tuning.

I`m realy interesting about sysctl.conf tuning settings for batch(3d rendering, phisycs simulations, etc.) servers. Does anybody has an experience with linux tuning - I mean memory and CPU settings for heavy loaded systems.

Would be great if somebody could tell me something about it. What kind of settings You have in Your clusters ? I`m working with Red Hat Enterprise 5 x86_64.
Old 06-28-2011, 08:15 AM   #2
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Only got some network tweaks :

# increase TCP max buffer size setable using setsockopt()
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
# increase Linux autotuning TCP buffer limits
# min, default, and max number of bytes to use
# set max to at least 4MB, or higher if you use very high BDP paths
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
# don't cache ssthresh from previous connection
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_moderate_rcvbuf = 1
# recommended to increase this for 1000 BT or higher
net.core.netdev_max_backlog = 2500
# for 10 GigE, use this
# net.core.netdev_max_backlog = 30000

# TCP Port for lock manager
fs.nfs.nlm_tcpport = 44865
# UDP Port for lock manager
fs.nfs.nlm_udpport = 32771
Old 06-28-2011, 09:14 AM   #3
Registered: Dec 2008
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Thanks, but I need settings mostly for CPU and memmory.


batch, linux, sysctl.conf, system, tuning

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