Re: [2.6 patch] always export sysctl_{r,w}mem_max

From: Rick Jones <redacted>
Date: Fri, 26 Oct 2007 16:46:36 -0700

David Miller wrote:

quoted

If DLM really wants minimum, it can use SO_SNDBUFFORCE and
SO_RCVBUFFORCE socket options and use whatever limits it
likes.

But even this is questionable.

Drift...

Is that something netperf should be using though?  Right now it uses the regular 
SO_[SND|RCV]BUF calls and is at the mercy of sysctls.  I wonder if it would be 
better to have it use their FORCE versions to make life easier on the 
benchmarker - such as myself - who has an unfortunate habit of forgetting to 
update sysctl.conf :)

The force calls are for root only.

And I want to remind you that explicitly setting socket
buffer sizes hurts performance with TCP.  I know you know
this but it bears restating for the benefit of others.