CentOS - Mar 2007 - net.ipv4 TCP/IP Optimizations = sysctl.conf?

On 3/19/07, Karl R. Balsmeier <karl at klxsystems.net>
wrote:
> If I execute these via command line, will they persist after a reboot?
>
> Or, should I be putting these into a file like /etc/sysctl.conf?
>
They will only persist if they are put in /etc/sysctl.conf. Whether
they do what you want.. is another question.


-- 
Stephen J Smoogen. -- CSIRT/Linux System Administrator
How far that little candle throws his beams! So shines a good deed
in a naughty world. = Shakespeare. "The Merchant of Venice"

On Mon, 19 Mar 2007 at 1:07pm, Karl R. Balsmeier wrote
> If I execute these via command line, will they persist after a reboot?
No.
> Or, should I be putting these into a file like /etc/sysctl.conf?
Yes.

-- 
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University

If I execute these via command line, will they persist after a reboot?

Or, should I be putting these into a file like /etc/sysctl.conf?

--------------snip--------------

/sbin/sysctl -w net.ipv4.tcp_max_syn_backlog=2048
/sbin/sysctl -w net.ipv4.tcp_fin_timeout=30
/sbin/sysctl -w net.ipv4.tcp_keepalive_intvl=10
/sbin/sysctl -w net.ipv4.tcp_keepalive_probes=7
/sbin/sysctl -w net.ipv4.tcp_keepalive_time=1800
/sbin/sysctl -w net.ipv4.tcp_max_tw_buckets=360000
/sbin/sysctl -w net.ipv4.tcp_synack_retries=3
/sbin/sysctl -w net.ipv4.tcp_rmem="4096 87380 16777216"
/sbin/sysctl -w net.ipv4.tcp_wmem="4096 87380 16777216"
/sbin/sysctl -w net.ipv4.tcp_mem="8388608 8388608 8388608"

--------------snip---------------

p.s. these are meant for a specific technology we use, so not sure if 
everyone reading would be best served by using them, mileage may vary!  : /

-karlski

Karl R. Balsmeier wrote:
> Stephen John Smoogen wrote:
> 
>> On 3/19/07, Karl R. Balsmeier <karl at klxsystems.net> wrote:
>> 
>>> If I execute these via command line, will they persist after a
>>> reboot? 
>>> 
>>> Or, should I be putting these into a file like /etc/sysctl.conf?
>>> 
>> 
>> They will only persist if they are put in /etc/sysctl.conf. Whether
>> they do what you want.. is another question.
>> 
>> 
> oh, they do what I want, they make things much much faster from a
> performance standpoint...
> 
I spent some time trying to tune the IP stack on one of our backup
servers without much improvement. Would you be willing to share your
test results/thoughts on the settings you posted?

Thanks

Dean.