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

    From Michael@21:1/5 to All on Wed Jul 23 19:44:17 2025
    On Wednesday, 23 July 2025 08:18:04 British Summer Time Dale wrote:
    Howdy,

    As most know, I use my puter to watch TV. Most of the time, it works
    fine. On this new rig tho, it does something my much slower old rig
    didn't do. When I need to copy files from one set of drives to another,
    the video stutters a bit. Sometimes it will stop for several seconds
    and it is annoying. I'm thinking ionice might help with this but there
    could also be a option in the kernel that would help as well. There may
    even be another way to make it not do this.

    Would setting ionice somehow for smplayer and its child processes work? Should I try to set ionice within Dolphin, what I usually use to copy
    files over, to make it a lower priority. I'd think setting one program
    would be easier but maybe not. Is there a better way that someone knows
    of that I don't know about? Kernel option maybe??

    Ideas on best way to correct this? If you need info, let me know. I
    can attach the kernel config or grep for certain options if needed.

    Thanks.

    Dale

    :-) :-)

    In the first instance you should set a suitable scheduler for your drive(s).
    I understand with SSD the 'Deadline' is appropriate, but at least for spinning drives you should give BFQ a try. You can red about BFQ here:

    Documentation/block/bfq-iosched.rst


    If you prefer, you can even switch the IO scheduler in real time while monitoring performance, to verify which IO scheduler works best for your use case:

    Documentation/block/switching-sched.rst


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  • From Michael@21:1/5 to All on Thu Jul 31 14:22:56 2025
    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.

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  • From Peter Humphrey@21:1/5 to All on Thu Jul 31 12:40:02 2025
    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?

    --
    Regards,
    Peter.

    --- SoupGate-Win32 v1.05
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