"global" TCP_NODELAY?

Bernd Walter ticso at cicely7.cicely.de
Mon Oct 12 12:24:28 UTC 2009

On Mon, Oct 12, 2009 at 01:42:08PM +0200, Ivan Voras wrote:
> Bernd Walter wrote:
> >On Mon, Oct 12, 2009 at 01:27:28PM +0200, Ivan Voras wrote:
> >>I'm trying to work around some extreme brain damageness in PHP (yes, it 
> >>sucks) which doesn't have a way to set TCP_NODELAY on stream sockets so 
> >>I'm wondering what are my other options? Is there a way to set 
> >>TCP_NODELAY system-wide?
> >
> >net.inet.tcp.delayed_ack
> >net.inet.tcp.delacktime
> >
> >Depending on your application it may be sufficient to just reduce the
> >time.
> Really? Doesn't TCP_NODELAY (Nagle's algorithm) work on buffers to be 
> sent rather than on ACKs on received data?

Good point.
TCP_NODELAY disables both to my knowledge.
And setting delacktime to 1 helped me in one buffer case.
But I'm not sure anymore - a non delayed ack might piggypack payload
much sooner of course.

B.Walter <bernd at bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.

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