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TCP_NODELAY is enabled at OS level

 
Redington
Occasional Contributor

TCP_NODELAY is enabled at OS level

Hi All,

 

We rae facing some issue with SAP running on HP-UX 11.31.  SAP has asked to check :TCP_NODELAY is enabled at OS level"

 

Please advise how to check and set this parameter.

 

HP-UX xxxxxxx B.11.31 U ia64 1075361838 unlimited-user license
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2 REPLIES
Laurent Menase
Honored Contributor

Re: TCP_NODELAY is enabled at OS level

Hi,

 

in fact enable TCP_NODELAY at os layer is usually not recommended at all

the parameter is tcp_naglim_def which should be set to 1.

 

This may have a real perf impact.

 

 

 

 

 

Laurent Menase
Honored Contributor

Re: TCP_NODELAY is enabled at OS level

forgot to mention

it is an unsupported ndd tunable

 

ndd -set /dev/tcp tcp_naglim_def 1

 

to have it effective on next reboot add it to /etc/rc.config.d/nddconf