[rabbitmq-discuss] Huge latency in Linux, compared with Leopard

Bogon Choi bogon.choi at gmail.com
Sun Sep 28 03:46:10 BST 2008


Ben Hood wrote:
> Holger,
> On Sat, Sep 27, 2008 at 9:24 PM, Holger Hoffstätte <holger at wizards.de>
> wrote:
>> Matthias Radestock wrote:
>>> Adding the line
>>>     -kernel inet_default_listen_options '[{nodelay, true}]' \
>>> to the options in the rabbitmq-server script does improve the results
>>> significantly.
> You're the man!
>> Nagle makes sense in order to maximize bandwidth and prevent wasting
>> packets for small payloads (~couple bytes, as for telnet) that can be
>> packed together into one MTU. This may or may not make sense for Rabbit
>> but is dependent on the network link and the payloads. So turning it off
>> may be the right thing for localhost/LAN messaging where the cost of a
>> single packet is low, but not at all for large(r) payloads and high
>> bandwidth or slower tranports. I doubt that there are any people left who
>> want to run over modem or carrier pidgeon..
> Of which there are a few:
> http://www.blug.linux.no/rfc1149/vegard_bilder/index.html
> Ben
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