Re: Latency spikes on V6.15.1 Preempt RT and maybe related to intel? IGB
From: Sebastian Andrzej Siewior
Date: Tue Jun 17 2025 - 05:29:33 EST
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