FreeTDS Development Group

[ZIGLIO Frediano <Frediano.Ziglio AT vodafoneomnitel.it>]

> 
> > my conclusions for now:
> > =======================
> > increasing packet size by factor 4 (2048 bytes) caused the 
> windows ASE to boost its perfomance , especially in freetds
> > (!!!) to the maximum write speed available !
> >
> > though, we can see that the linux ASE boosted by factor 2 
> (36-34 lines per second) , which is a nice to have,
> > but not as
> > windows, so maybe the ASE linux developers still have a 
> work to do ...
> 
> i request please your attention to what i wrote before:
> how can you explain the performance decrease  between linux 
> and windows ASE servers ?
> (200 --> 36 LPS)
> 

Only for packet difference ??
I don't know. FreeTDS approch is to fill all buffer until packet and then
send it. Perhaps a best approch would be to cache even multiple packet and
send together... I have also some idea for improving write speed locally
(using some more space and simpler pointer instead of calling a function for
every write...)
Or perhaps problem is somewhere else. Some numeric conversions are very slow
(400 against 100000...). Perhaps when we use 512 byte packet, and more than
13/14 fields with many numeric (as your example) those conversions are more
taken into account... James are working on this conversions to improve
performance.
Another problem is prepared statement. Although this area have seen some
improvements in 0.61 there are more works to do. This will avoid many
conversions and save some networks band (and some server work too).

Personally I'm very busy at the moment so I have few time to make test on my
own... Quite all the time I spent on FreeTDS nowadays is reading mail...

Finally I want to thanks you for all yours patience and feedback.

Regards
  Frediano Ziglio

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