linux-kernel - Re: [PATCH 5/5] sched_ext: Use shorter slice while bypassing

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Message-ID: <20240926220721.GG26346@maniforge>
Date: Thu, 26 Sep 2024 17:07:21 -0500
From: David Vernet <void@...ifault.com>
To: Tejun Heo <tj@...nel.org>
Cc: kernel-team@...a.com, linux-kernel@...r.kernel.org, sched-ext@...a.com
Subject: Re: [PATCH 5/5] sched_ext: Use shorter slice while bypassing

On Tue, Sep 24, 2024 at 02:06:07PM -1000, Tejun Heo wrote:

Hi Tejun,

> While bypassing, tasks are scheduled in FIFO order which favors tasks that
> hog CPUs. This can slow down e.g. unloading of the BPF scheduler. While
> bypassing, guaranteeing timely forward progress is the main goal. There's no
> point in giving long slices. Shorten the time slice used while bypassing
> from 20ms to 5ms.

My vote would be to just update SCX_SLICE_DFL to be 5ms, but this is fine as
well if you'd prefer to leave the default slice as something that observably
works well for throughput in fair schedulers.

Acked-by: David Vernet <void@...ifault.com>

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