linux-kernel - Re: [RFC PATCH 0/2] Introduce per-task io utilization boost

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Message-ID: <787fe4b7-a5af-4cd1-a7e8-8b9bad3be7d9@acm.org>
Date: Mon, 25 Mar 2024 10:23:07 -0700
From: Bart Van Assche <bvanassche@....org>
To: Christian Loehle <christian.loehle@....com>,
 Qais Yousef <qyousef@...alina.io>
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org,
 juri.lelli@...hat.com, mingo@...hat.com, rafael@...nel.org,
 dietmar.eggemann@....com, vschneid@...hat.com, vincent.guittot@...aro.org,
 Johannes.Thumshirn@....com, adrian.hunter@...el.com, ulf.hansson@...aro.org,
 andres@...razel.de, asml.silence@...il.com, linux-pm@...r.kernel.org,
 linux-block@...r.kernel.org, io-uring@...r.kernel.org,
 linux-mmc@...r.kernel.org
Subject: Re: [RFC PATCH 0/2] Introduce per-task io utilization boost

On 3/25/24 05:06, Christian Loehle wrote:
> On 21/03/2024 19:52, Bart Van Assche wrote:
>> On 3/21/24 10:57, Christian Loehle wrote:
>>> In the long-term it looks like for UFS the problem will disappear as we are
>>> expected to get one queue/hardirq per CPU (as Bart mentioned), on NVMe that
>>> is already the case.
>>
>> Why the focus on storage controllers with a single completion interrupt?
>> It probably won't take long (one year?) until all new high-end
>> smartphones may have support for multiple completion interrupts.
> 
> Apart from going to "This patch shows significant performance improvements on
> hardware that runs mainline today" to "This patch will have significant
> performance improvements on devices running mainline in a couple years"
> nothing in particular.

That doesn't make sense to me. Smartphones with UFSHCI 4.0 controllers
are available from multiple vendors. See also 
https://en.wikipedia.org/wiki/Universal_Flash_Storage. See also
https://www.gsmarena.com/samsung_galaxy_s24-12773.php.

Bart.