Hi Robert! I guess these latencies didn't show up at the system you are porting from? Is the HW setup from the system you are porting from the same as you are using with -rt? Are both, sender and receiver are using -rt? What happens if you are using the old system as sender and -rt for the receiver? What happens if you are using -rt as sender and -rt as receiver? Are you using an onboard nvidia SATA controller? regards Bernhard - 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