Messages in this thread | | | Date | Tue, 16 Aug 2022 18:25:23 +0300 | Subject | Re: stalling IO regression since linux 5.12, through 5.18 | From | Nikolay Borisov <> |
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On 16.08.22 г. 17:22 ч., Chris Murphy wrote: > > > On Sun, Aug 14, 2022, at 4:28 PM, Chris Murphy wrote: >> On Fri, Aug 12, 2022, at 2:02 PM, Jens Axboe wrote: >>> Might be worth trying to revert those from 5.12 to see if they are >>> causing the issue? Jan, Paolo - does this ring any bells? >> >> git log --oneline --no-merges v5.11..c03c21ba6f4e > bisect.txt >> >> I tried checking out a33df75c6328, which is right before the first bfq >> commit, but that kernel won't boot the hardware. >> >> Next I checked out v5.12, then reverted these commits in order (that >> they were found in the bisect.txt file): >> >> 7684fbde4516 bfq: Use only idle IO periods for think time calculations >> 28c6def00919 bfq: Use 'ttime' local variable >> 41e76c85660c bfq: Avoid false bfq queue merging >>>>> a5bf0a92e1b8 bfq: bfq_check_waker() should be static >> 71217df39dc6 block, bfq: make waker-queue detection more robust >> 5a5436b98d5c block, bfq: save also injection state on queue merging >> e673914d52f9 block, bfq: save also weight-raised service on queue merging >> d1f600fa4732 block, bfq: fix switch back from soft-rt weitgh-raising >> 7f1995c27b19 block, bfq: re-evaluate convenience of I/O plugging on rq arrivals >> eb2fd80f9d2c block, bfq: replace mechanism for evaluating I/O intensity >>>>> 1a23e06cdab2 bfq: don't duplicate code for different paths >> 2391d13ed484 block, bfq: do not expire a queue when it is the only busy >> one >> 3c337690d2eb block, bfq: avoid spurious switches to soft_rt of >> interactive queues >> 91b896f65d32 block, bfq: do not raise non-default weights >> ab1fb47e33dc block, bfq: increase time window for waker detection >> d4fc3640ff36 block, bfq: set next_rq to waker_bfqq->next_rq in waker >> injection >> b5f74ecacc31 block, bfq: use half slice_idle as a threshold to check >> short ttime >> >> The two commits prefixed by >>> above were not previously mentioned by >> Jens, but I reverted them anyway because they showed up in the git log >> command. >> >> OK so, within 10 minutes the problem does happen still. This is >> block/bfq-iosched.c resulting from the above reverts, in case anyone >> wants to double check what I did: >> https://drive.google.com/file/d/1ykU7MpmylJuXVobODWiiaLJk-XOiAjSt/view?usp=sharing > > Any suggestions for further testing? I could try go down farther in the bisect.txt list. The problem is if the hardware falls over on an unbootable kernel, I have to bug someone with LOM access. That's a limited resource. > >
How about changing the scheduler either mq-deadline or noop, just to see if this is also reproducible with a different scheduler. I guess noop would imply the blk cgroup controller is going to be disabled
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