linux-kernel - Re: WQ_UNBOUND workqueue warnings from multiple drivers

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Date: Thu, 9 May 2024 09:36:28 +0300
From: Sagi Grimberg <sagi@...mberg.me>
To: Kamaljit Singh <Kamaljit.Singh1@....com>,
 Chaitanya Kulkarni <chaitanyak@...dia.com>
Cc: "kbusch@...nel.org" <kbusch@...nel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
Subject: Re: WQ_UNBOUND workqueue warnings from multiple drivers



On 09/05/2024 2:16, Kamaljit Singh wrote:
> Sagi,
>
>> Does this happen with a 90-%100% read workload?
> Yes, we’ve now seen it with 100% reads as well. Here’s the Medusa cmd we used. I’ve removed the devices for brevity.
> sudo /opt/medusa_labs/test_tools/bin/maim 20g -b8K -Q128 -Y1 -M30 --full-device -B3 -r -d900000 <device_list>
>   
> We saw the original issue with the upstream kernel v6.6.21. But now we’re also seeing it with Ubuntu 24.04 (kernel 6.8.0-31-generic), where IOs are timing out and forcing connection drops.

Thanks for the info.

>   
>   
>> Question, are you working with a Linux controller?
> No, with our ASIC (NVMe Fabrics bridge).
>   
>> what is the ctrl ioccsz?
> ioccsz    : 4

I see, what is the mdts? and what are the r2t lengths the controller is 
sending to the host?