On 2025-06-14 10:52:36 [+0200], Marc Strämke wrote: > ip-4931 [001] b...3 700.149995: igb_update_mc_addr_list <-igb_set_rx_mode > ip-4931 [001] Dn..3 700.150795: irq_disable: caller=irqentry_enter+0x2a/0x60 parent=0x0 Between those two functions you have 800us delay. Interrupts are not disabled so the CPU stalls. As explained earlier, I expect the read on the bus flushes the writes causing the spike. Sebastian
