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MyODBC very slow connection on Hyperthreading Server
Posted by: Ricardo Creasy
Date: January 18, 2005 08:00PM

I have had a very busy week testing on differents pc's and servers
to try to replicate the problem and now I can document it, to see
if someone has had the same problem and a solution is found.

The enviroment, Local network with fixed ip's, same subnet

I have test this with

MyODBC 3.51.07, 3.51.08, 3.51.09, 3.51.10

The same problems with all,

The tested client pcs is XP and XP SP2,

The Operating System of the Server where MySQL is running
is Fedora Core 2, Tested with MySQL Server 4.1.5, 4.1.7, 4.1.8, 4.1.9,

The problem is that if I try with the same MySQL Version and Operating
System on differentents server platforms it hangs,
with a Pentium IV with HyperThreading or Xeon With HyperThreading
enabled or disabled( both ways) , it takes from 30 seconds to 2 minutes
the test datasource from the ODBC Settings, and sometimes it does not
even connect at all.

If same operating system, same MySQL Server version, I test on a server Pentium III or Pentium IV with no HyperThreading technology
it connects in one second,

I did several testing and find no valid reason for this behavior, I find no
information of this issue over the internet,

Has anyone had this problem? I wonder what is wrong with MyODBC and HyperThreading technology if that is the case?

Any help is welcome,

Regards,

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