John Sigler wrote:
( check_dektec_in-1095 |#0): new 271 us user-latency. ( check_dektec_in-1095 |#0): new 275 us user-latency. ( check_dektec_in-1095 |#0): new 290 us user-latency. ( check_dektec_in-1095 |#0): new 297 us user-latency. ( check_dektec_in-1095 |#0): new 345 us user-latency. ( check_dektec_in-1095 |#0): new 358 us user-latency. ( check_dektec_in-1095 |#0): new 384 us user-latency. ( check_dektec_in-1095 |#0): new 392 us user-latency. ( check_dektec_in-1095 |#0): new 395 us user-latency. ( check_dektec_in-1095 |#0): new 396 us user-latency. ( check_dektec_in-1095 |#0): new 1031 us user-latency. ( check_dektec_in-1095 |#0): new 1100 us user-latency. ( check_dektec_in-1095 |#0): new 1105 us user-latency. ( check_dektec_in-1095 |#0): new 1106 us user-latency. Here's the function trace for the 1106-µs latency: http://linux.kernel.free.fr/latency/1106-us-trace.txt
The function trace for 400-µs latencies is different: ( check_dektec_in-1145 |#0): new 275 us user-latency. ( check_dektec_in-1145 |#0): new 276 us user-latency. ( check_dektec_in-1145 |#0): new 288 us user-latency. ( check_dektec_in-1145 |#0): new 289 us user-latency. ( check_dektec_in-1145 |#0): new 289 us user-latency. ( check_dektec_in-1145 |#0): new 290 us user-latency. ( check_dektec_in-1145 |#0): new 297 us user-latency. ( check_dektec_in-1145 |#0): new 345 us user-latency. ( check_dektec_in-1145 |#0): new 354 us user-latency. ( check_dektec_in-1145 |#0): new 377 us user-latency. ( check_dektec_in-1145 |#0): new 393 us user-latency. http://linux.kernel.free.fr/latency/393-us-trace.txt There are ~200 calls to ioread32 from mdio_read from speedo_timer. http://lxr.linux.no/source/drivers/net/eepro100.c#L1159 http://lxr.linux.no/source/drivers/net/eepro100.c#L928 In this case, and as far as I understand, the culprit is the eepro100 driver talking to one of the NICs (which one?). Is that correct? What is the consequence of IRQ10 being shared by eth2 and by my I/O board? How can I force Linux to assign different IRQs to every peripheral if I have free IRQs lines? Regards. - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
