On 09. 10. 2018 19:26, Eric Dumazet wrote: > On Tue, Oct 9, 2018 at 10:22 AM Gasper Zejn <zelo.z...@gmail.com> wrote: >> On 09. 10. 2018 19:00, Eric Dumazet wrote: >>> On 10/09/2018 09:38 AM, Gasper Zejn wrote: >>>> Hello, >>>> >>>> I am seeing interrupt storms of over 100k-900k local timer interrupts >>>> when changing between network devices or networks with open TCP >>>> connections when not using sch_fq (I was using pfifo_fast). Using sch_fq >>>> makes the bug with interrupt storm go away. >>>> >>> That is for what kind of traffic ? >>> >>> If your TCP flows send 100k-3M packets per second, then yes, the pacing >>> timers >>> could be setup in the 100k-900k range. >>> >> Traffic is nowhere in that range, think of having a few browser tabs of >> javascript rich >> web pages open, mostly idle, for example slack, gmail or tweetdeck. No >> significant >> packet rate is needed, just open connections. > No idea of what is going on really. A repro would be nice.
I've tried to isolate the issue as best I could. There seems to be an issue if the TCP socket has keepalive set and send queue is not empty and the route goes away. https://github.com/zejn/bbr_pfifo_interrupts_issue Hope this helps, Gasper
