hi,
On Wed, 2002-01-16 at 10:58, Sacha Labourey wrote:
> I guess that if you want to modify this, you need to make it optional.
>
> The TCPNODELAY flag is related to the Nagle's algorithm
true.
> This algorithm is made to avoid sending very small paquets each time you
> send data through your socket [...]
primarily useful for telnet/ssh style applications.
> I am not familiar with JBossMQ code base but if you think that the
> implementation could, at some time, send many small messages and would
JBossMQ sends packets whenever a message needs to be delivered via the
IL (except for the InVM layer but we can put that aside).
> suffer from sending each time a paquet, then you should most probably make
> this setting optional. But, on the opposite, if you think that your paquet
> (*all* paquets, even ACK) always have a sufficient size and don't want Nagle
> to take care of you, then it is up to you.
... don't forget the new pinger thread which tries to ping the server
every once in a while to ensure its still up and running.
bottom line: TCP_NODELAY should be set to *enabled* whenever you're in a
low latency / high bandwidth situation, i.e. LAN or something similiar.
I guess this applies to at the very least 80% of the JBossMQ
installations out there.
I would disable TCP_NODELAY only when being in a very low bandwidth /
high latency situation.
Loren, can you pls. submit a patch via SourceForge (or send it to this
list) and we'll get this integrated into the codebase.
Regarding Mac OS/X in this situation: it could very well be that their
default mode of operation is to have TCP_NODELAY disabled by default,
even when running on the loopback device -- you ARE using 127.0.0.1
after all, right?. On my Linux box this is a switch when configuring the
kernel (at least it has been when I was still building my own kernels
... which hasn't happened since 2.0.something).
Regards,
Christian
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