Thanks - would that be the TCP_NODELAY jobby ? -----Original Message----- From: James Strachan [mailto:[EMAIL PROTECTED] Sent: 22 June 2006 11:30 To: [email protected] Subject: Re: ThroughPut : Small vs Large Messages
It could be the Nagler kicking in - i.e. it might take a little while for the TCP buffers to be flushed to the network for smaller messages. You can tune TCP to enable/disable waiting for complete tcp buffers before actually sending it to the network - its a throughput v latency tradeoff setting. On 6/22/06, Charles Anthony <[EMAIL PROTECTED]> wrote: > Hi, > > We use AMQ (4) as the client/server transport in our system. For some of our > clients, we host the application at our site, and though connect remotely > via VPN. Sometimes, we (well, usually they) have trouble setting up the VPN > and setting firewall configs etc - so I am just knocking together a little > noddy diagnostics program - i.e. connect to the AMQ server, create a temp > queue, create a producer, create a consumer, send and receive a load of > messages. > > All well and good. > > I thought I'd go a bit crazy, then, and try and work out message throughput > based on message size (i.e. send & reveive A x byte[B] => bytes sent = A*B, > bytes-per-second= A*B/num-secs) - not as a real measurement, but more as > wavy-hand type uide. > I've turned async send off for this diagnostic thingy, and messages are sent > NON_PERSISTENT. > > Here's the weird thing. > > If send small messages ( < 1300 ish bytes), I am getting roundtrip of approx > 200 ms > If send larger messages ( > 1300 ish bytes - say 2048), I am getting > roundtip of < 15 ms > > > Is there a reasonable explanation for this ? Maybe compression kicking in ? > I'm just a bit befuddled. > > Cheers, > > Charles. > > > ___________________________________________________________ > HPD Software Ltd. - Helping Business Finance Business > Email terms and conditions: www.hpdsoftware.com/disclaimer > > > -- James ------- http://radio.weblogs.com/0112098/ ___________________________________________________________ HPD Software Ltd. - Helping Business Finance Business Email terms and conditions: www.hpdsoftware.com/disclaimer
