Re: [gentoo-user] Video sometimes stuttering. Need help with ionice, maybe?

[Dale <rdalek1967@gmail.com>]

Michael wrote:
> On Thursday, 31 July 2025 12:25:01 British Summer Time Dale wrote:
>> Peter Humphrey wrote:
>>> On Wednesday, 30 July 2025 18:25:00 British Summer Time Dale wrote:
>>>> I rebooted the new kernel and the BFQ setting is doing a GREAT job.  I've
>>>> copied several GBs of data since the change and my videos play like a
>>>> champ.  I've yet to see a single stutter or pause.
>>> Have you selected either of the other schedulers as well?
>> From my understanding, you can only select one at a time.  So far, this
>> is working wonderfully.  A lot better than the previous one.  What
>> scheduler ones uses depends on what one needs.  For some applications,
>> others may work better.  For what I need, BFQ is awesome. 
>>
>> Can one use more than one at a time?
>>
>> Dale
>>
>> :-)  :-) 
> With more than one scheduler trying to manage the IO data queues on the 
> device, which scheduler will win the fight?  The scheduler which messes up the 
> others' queues faster?  LOL!  :-)
>
> On multi-queue SSDs the difference between IO schedulers is small, so setting 
> it to none (noop) removes any pointless kernel load.  However, some have 
> reported mq-deadline performed slightly better on their gear.
>
> A quick test will prove what scheduler suits best each use case.


That was my thinking.  I'm trying to think of a reason why a person
would want to use two different ones anyway.  As you point out, one is
going to fight the other.  It's likely best to pick the one that works
best for the situation instead of trying to apply two or more and end up
with a nasty fight.  May not lose data but could upset a hard drive wear
and tear wise. 

Right now, BFQ is doing great.  I see no reason to switch to anything
else.  From what I've read, and seen in a couple videos, BFQ is the best
option for what I need.  I'll share video links below. 

You know, my rig and the software I have installed, it has gave me a
awesome system.  I'm thinking of upgrading the CPU tho.  I have a AMD
Ryzen 7 5800X 8-Core CPU right now.  Looking at a 5950X 16 core one. 
May be a year off yet tho.  I'm not sure how to deal with gkrellm tho. 
It already goes from top to bottom of my screen.  Additional cores is
going to make it to tall.  May have to run more than one gkrellm
somehow.  CPU cores, processes and sensor info on one and drive data on
another instance.  I gotta think on that. 

Video links. 

https://www.youtube.com/watch?v=J-e7LnJblm8  Demo of the performance of
the bfq disk I/O scheduler on a hard disk

https://www.youtube.com/watch?v=KhZl9LjCKuU  BFQ back in action

and

https://www.youtube.com/watch?v=1cjZeaCXIyM  BFQ-v7r6 versus CFQ,
DEADLINE and NOOP on an SSD

Dale

:-)  :-)