Less than half I/O-Speed from RTAI patch?

[rolf.freitag at email.de]

Hi,

i see the bad performance also when no I/O is done: When 2 user space single threaded 
programs do make simple calculations on the SMP box (dual P III 1000), for some minutes
the load average is not the expected 1; it's around 20 and growing! It takes about a minute
for a keystroke to take effect although top shows no reason of this high load.
After the 2 programs terminated the system reacts normally and the loadaverage is near zero.
Any ideas?

Regards,

Rolf


rolf.freitag at email.de schrieb am 07.09.05 00:34:34:
> 
> 
> Hi,
> 
> i measured the speed at reading from an ISA card (only inw()) with unpatched
> SuSE and Debian and with an 2.6.9 kernel patched with RTAI (3.2 stable):
> With RTAI the speed is less than half the speed under SuSE or Debian. 
> Because i used make oldconfig for the patched kernel it seems that the RTAI
> patch slows down ISA I/O.
> Is this true or where else may be the reason of the slow I/O speed?
> 
> Regards,
> 
> Rolf
> 
> 
> 
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