linux-kernel - Re: [RFC PATCH 0/2] block: CPU latency PM QoS tuning

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Message-ID: <f4cdcb6e6cbef86629b2924bd630ef9e0ad0f673.camel@linux.intel.com>
Date: Fri, 30 Aug 2024 15:01:51 +0300
From: Tero Kristo <tero.kristo@...ux.intel.com>
To: Bart Van Assche <bvanassche@....org>, axboe@...nel.dk
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/2] block: CPU latency PM QoS tuning

On Thu, 2024-08-29 at 07:04 -0400, Bart Van Assche wrote:
> On 8/29/24 3:18 AM, Tero Kristo wrote:
> > Any thoughts about the patches and the approach taken?
> 
> The optimal value for the PM QoS latency depends on the request size
> and on the storage device characteristics. I think it would be better
> if the latency value would be chosen automatically rather than
> introducing yet another set of tunable sysfs parameters.

Are these device parameters stored somewhere in the kernel? I did try
looking for this kind of data but could not find anything useful; thats
the main reason I implemented the sysfs tunables.

-Tero

> 
> Thanks,
> 
> Bart.
>