linux-ext4 - Re: Write I/O queue hangup at random on recent Linus' kernels

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Message-ID: <be6a783-97db-c3bf-b16f-e8c62b14755d@panix.com>
Date:   Thu, 25 Nov 2021 13:05:16 -0800 (PST)
From:   "Kenneth R. Crudup" <kenny@...ix.com>
To:     Jens Axboe <axboe@...nel.dk>
cc:     linux-bcache@...r.kernel.org, linux-block@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-nvme@...ts.infradead.org,
        "Kenneth R. Crudup" <kenny@...ix.com>
Subject: Re: Write I/O queue hangup at random on recent Linus' kernels


On Tue, 23 Nov 2021, Jens Axboe wrote:

> It looks like some missed accounting. You can just disable wbt for now, would
> be a useful data point to see if that fixes it. Just do:

> echo 0 > /sys/block/nvme0n1/queue/wbt_lat_usec

> and that will disable writeback throttling on that device.

It's been about 48 hours and haven't seen the issue since doing this.

	-Kenny

-- 
Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting, Orange County CA