Re: Fwd: arXiv endorsement request from Zhouyi Zhou

On Wed, Sep 03, 2025 at 06:42:10PM +0800, Zhouyi Zhou wrote:
> Dear Paul and RCUers,
> 
> Our company wants to submit a paper titled "Towards Deterministic Sub-0.5
> µs Response on Linux through Interrupt Isolation" to arXiv, but since this
> is the first time we submit to arXiv, we need an endorsement, can you
> endorse me if convenient?
> 
> Following is the abstract of the paper, we can also provide the full
> content of the paper if you need.

Hello, Zhouyi, and I would of course be happy to help in any way that
I can.  Please do send me the full paper.  A quick skim of the abstract
suggests that you are doing something similar to isolcpus and nohz_full,
along with control of interrupts.

The interrupt latency of 0.5 microseconds is of course quite a bit better
than I have heard of anyone doing on x86, which is constrained by corner
cases involving paging and other issues.  I would expect people to ask
how long you ran your experiments, given that there have been people who
achieved excellent numbers by running their experiments for too short
a time for some of the aforementioned corner cases to arise.

My main concern is whether or not I am "someone who's registered as
an endorser for the cs.OS (Operating Systems) subject class of arXiv".
But I guess I will find out when I attempt to endorse you.  ;-)

Again, please do send me a copy of the full paper.

							Thanx, Paul

> Thank you in advance
> Zhouyi
> --
> Real-time responsiveness in Linux is often constrained by interrupt
> contention and timer
> handling overhead, making it challenging to achieve sub-microsecond latency.
> This work introduces an interrupt isolation approach that centralizes and
> minimizes timer
> interrupt interference across CPU cores. By enabling a dedicated API to
> selectively invoke
> timer handling routines and suppress non-critical inter-processor
> interrupts,
> our design significantly reduces jitter and response latency. Experiments
> conducted on an ARM-based multicore
> platform demonstrate that the proposed mechanism consistently achieves
> sub-0.5 µs response
> times, outperforming conventional Linux PREEMPT-RT configurations. These
> results highlight
> the potential of interrupt isolation as a lightweight and effective
> strategy for
> deterministic real-time workloads in general-purpose operating systems.
> ---
> ---------- Forwarded message ---------
> From: <[email protected]>
> Date: Wed, Sep 3, 2025 at 6:02 PM
> Subject: arXiv endorsement request from Zhouyi Zhou
> To: <[email protected]>
> 
> 
> (Zhouyi Zhou should forward this email to someone who's registered as an
> endorser for the cs.OS (Operating Systems) subject class of arXiv.)
> 
> Zhouyi Zhou requests your endorsement to submit an article to the cs.OS
> section of arXiv. To tell us that you would (or would not) like to
> endorse this person, please visit the following URL:
> 
> https://arxiv.org/auth/endorse?x=TNW38B
> 
> If that URL does not work for you, please visit
> 
> http://arxiv.org/auth/endorse.php
> 
> and enter the following six-digit alphanumeric string:
> 
> Endorsement Code: TNW38B