Re: Intel Ethernet driver igb causes huge latencies with cyclictest (rt-tests)

2016-10-05 Thread Greg
On Wed, 2016-10-05 at 08:29 +, Koehrer Mathias (ETAS/ESW5) wrote: > Hi all, > > I noticed that with fairly new versions of the Linux kernel, the igb driver > causes huge latencies with the cyclictest in a RT_PREEMPT environment. > The root cause seems to be the number of interrupts that are us

Intel Ethernet driver igb causes huge latencies with cyclictest (rt-tests)

2016-10-05 Thread Koehrer Mathias (ETAS/ESW5)
Hi all, I noticed that with fairly new versions of the Linux kernel, the igb driver causes huge latencies with the cyclictest in a RT_PREEMPT environment. The root cause seems to be the number of interrupts that are used for the igb NIC devices as multiple of these irqs may occur at the same time