You are able to adjust time to initiate IRQ by the following way.
modprobe wct4xxp ms_per_irq=2 (wct4xxp is the card driver you want to load)
ms_per_irq=2 means every 2 millisecond initiate once IRQ.The valid values of ms_per_irq are one of 1,2,4,8,16, and the default value is 1.
I have one more doubt lets say I am changing the Interrupt number and Interrupt pin, in lspci it is showing the changes, after I do dahdi restart, only the Interrupt pin changed to the value what i changed but the interrupt number it is showing some dynamic number. Is that normal? please advice.