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From: Jens Axboe <axboe@kernel.dk>
To: "Kenneth R. Crudup" <kenny@panix.com>
Cc: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org,
	linux-ext4@vger.kernel.org, linux-nvme@lists.infradead.org,
	Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Subject: Re: Write I/O queue hangup at random on recent Linus' kernels
Date: Fri, 26 Nov 2021 11:10:09 -0700	[thread overview]
Message-ID: <ddc41b84-c414-006a-0840-250281caf1e5@kernel.dk> (raw)
In-Reply-To: <986e942b-d430-783b-5b1c-4525d4a94e48@panix.com>

On 11/26/21 10:58 AM, Kenneth R. Crudup wrote:
> 
> On Fri, 26 Nov 2021, Jens Axboe wrote:
> 
>> Can you apply this on top of 5.16-rc2 or current -git and see if it fixes
>> it for you?
> 
> Since it's related to writeback throttling, is there anything I can try to
> taunt it? I was thinking "iozone" or "bonnie++", but if there's something
> better, let me know.

I'd just do what you usually do, that's usually the best way to gain
confidence in the fix. But it's related to writeback throttling _and_
racing with eg iostats grabbing a reference to the request, so it would
be more likely to trigger with a heavier combination of those two.

That said, I'm pretty confident in the fix, so if you'd just use it for
a day or two, then with the previous amount of hangs you saw on -rc2 it
should provide a good level of confidence in it.

-- 
Jens Axboe


  reply	other threads:[~2021-11-26 18:36 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-23 21:05 Write I/O queue hangup at random on recent Linus' kernels Kenneth R. Crudup
2021-11-23 23:23 ` Kenneth R. Crudup
2021-11-23 23:27 ` Jens Axboe
2021-11-23 23:35   ` Kenneth R. Crudup
2021-11-25 21:05   ` Kenneth R. Crudup
2021-11-25 21:07     ` Jens Axboe
2021-11-25 21:11       ` Kenneth R. Crudup
2021-11-26 16:53       ` Jens Axboe
2021-11-26 17:09         ` Kenneth R. Crudup
2021-11-26 17:58         ` Kenneth R. Crudup
2021-11-26 18:10           ` Jens Axboe [this message]
2021-11-26 18:20             ` Kenneth R. Crudup
2021-11-26 18:41               ` Jens Axboe
2021-11-28  0:11                 ` Kenneth R. Crudup
2021-11-28 14:50                   ` Jens Axboe
2021-12-02 15:13     ` Kenneth R. Crudup
2021-12-02 15:37       ` Kenneth R. Crudup

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