linux-kernel - Re: [RFC PATCH 0/4] softirq: Per vector threading v3

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Message-ID: <20180301152132.GB29639@lerouge>
Date:   Thu, 1 Mar 2018 16:21:33 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Mauro Carvalho Chehab <mchehab@...pensource.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Levin Alexander <alexander.levin@...izon.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Wanpeng Li <wanpeng.li@...mail.com>,
        Dmitry Safonov <dima@...sta.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Radu Rendec <rrendec@...sta.com>,
        Ingo Molnar <mingo@...nel.org>,
        Stanislaw Gruszka <sgruszka@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [RFC PATCH 0/4] softirq: Per vector threading v3

On Wed, Feb 07, 2018 at 12:18:44PM -0200, Mauro Carvalho Chehab wrote:
> Em Fri, 19 Jan 2018 16:46:10 +0100
> Frederic Weisbecker <frederic@...nel.org> escreveu:
> 
> > As per Linus suggestion, this take doesn't limit the number of occurences
> > per jiffy anymore but instead defers a vector to workqueues as soon as
> > it gets re-enqueued on IRQ tail.
> > 
> > No tunable here, so testing should be easier.
> 
> Sorry for taking so long to test it. Just returned this week from a 2
> weeks travel, and had first to submit media patches for the merge window.
> 
> Didn't work. With this patch series, it still lose frames with
> usb bulk transfers, while recording DVB programs with tvheadend.

How can we reproduce this workload?