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MQSeries.net Forum Index » IBM MQ Installation/Configuration Support » Minimum Message Size

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ryen
PostPosted: Thu Sep 02, 2004 5:17 am    Post subject: Minimum Message Size Reply with quote

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Joined: 02 Sep 2004
Posts: 4

Folks,

Is there a minimum message size for WMQ?

The underneth ethernet packet has a minimum size like 64 bytes or 512 bytes (from 10Mbps to Gigafast network), I'm just wondering would WMQ also set a minimum message size? In the case of a small size message, like 16 bytes, would WMQ pad it up to ethernet packet minimum size, in addition to WMQ's header and other overhead?

Any comments are highly appreciated.

Robert
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PGoodhart
PostPosted: Thu Sep 02, 2004 6:20 am    Post subject: Reply with quote

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Joined: 17 Jun 2004
Posts: 278
Location: Harrisburg PA

There is a minimum size greater then, since MQ automatically appends some header information. I know it is documented in the manuals.
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ryen
PostPosted: Thu Sep 02, 2004 6:21 am    Post subject: additional info Reply with quote

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Joined: 02 Sep 2004
Posts: 4

I found this at IBM site - http://www-1.ibm.com/support/docview.wss?uid=swg21040449
But not sure if 512 bytes is the "real" Minimum Message Size for today's WebSphere MQ product. The version I'm using is v5.3.
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ryen
PostPosted: Thu Sep 02, 2004 6:32 am    Post subject: Reply with quote

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Joined: 02 Sep 2004
Posts: 4

Patrick,

Do you know which manual document? I searched IBM site - http://www-306.ibm.com/software/integration/mqfamily/library/manualsa/manuals/crosslatest.html, but came up short. Could you be more specific on which document?

Thanks

Robert
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PGoodhart
PostPosted: Thu Sep 02, 2004 9:07 am    Post subject: Reply with quote

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Joined: 17 Jun 2004
Posts: 278
Location: Harrisburg PA

I can't seem to find it at the moment, but your 512K is in the right ballpark. It may be larger but I am sure it isn't smaller.
If I come across it I'll let you know.
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ryen
PostPosted: Thu Sep 02, 2004 9:12 am    Post subject: Reply with quote

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Thanks!
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Michael Dag
PostPosted: Thu Sep 02, 2004 10:54 am    Post subject: Reply with quote

Jedi Knight

Joined: 13 Jun 2002
Posts: 2607
Location: The Netherlands (Amsterdam)

I think you are looking for this...

http://www.mqseries.net/phpBB2/viewtopic.php?t=14888

took some back and forth calculating
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