linux-kernel - Re: stalling IO regression since linux 5.12, through 5.18

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Date:   Wed, 17 Aug 2022 14:54:42 -0400
From:   "Chris Murphy" <lists@...orremedies.com>
To:     "Jan Kara" <jack@...e.cz>
Cc:     Holger Hoffstätte <holger@...lied-asynchrony.com>,
        "Nikolay Borisov" <nborisov@...e.com>,
        "Jens Axboe" <axboe@...nel.dk>,
        "Paolo Valente" <paolo.valente@...aro.org>,
        Linux-RAID <linux-raid@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "Josef Bacik" <josef@...icpanda.com>
Subject: Re: stalling IO regression since linux 5.12, through 5.18



On Wed, Aug 17, 2022, at 2:33 PM, Jan Kara wrote:
> On Wed 17-08-22 14:18:01, Chris Murphy wrote:
>> 
>> 
>> On Wed, Aug 17, 2022, at 2:15 PM, Jan Kara wrote:
>> 
>> > OK, if this indeed passes then b6e68ee82585 ("blk-mq: Improve performance
>> > of non-mq IO schedulers with multiple HW queues") might be what's causing
>> > issues (although I don't know how yet...).
>> 
>> I can revert it from 5.12.0 and try. Let me know which next test is preferred :)
>
> Let's try to revert this first so that we have it narrowed down what
> started causing the issues. 

OK I've reverted b6e68ee82585, and removing megaraid_sas.host_tagset_enable=0, and will restart the workload...

Usually it's within 10 minutes but the newer the kernel it seems the longer it takes, or the more things I have to throw at it. The problem doesn't reproduce at all with 5.19 series unless I also run a separate dnf install, and that only triggers maybe 1 in 3 times.

-- 
Chris Murphy