Hi, I have written a device driver for an own PCI card reading bytes from a process signal frame. The driver is running quite well (2,4 GHz dual Core) reading one byte is done in about 4 microseconds. The problem is, that sometimes the read of one byte need up to 80 microseconds. The driver uses ddi calls for reading registers on the PCI card. I have done some dtrace tests, but no results up to now. I want to switch on the trace by passing driver _entry probe and switch of passing the driver _return probe. I've checked the on-cpu, off-cpu, interupt-start, probes etc - but no result.
Any ideas to catch the reason for the 80 microseconds-read are welcome!! (scheduling, timer, interrupts,...???) Any suggestions for helpful dtrace probes ? Thanks sigi -- This message posted from opensolaris.org _______________________________________________ dtrace-discuss mailing list [email protected]
