From: Francois Romieu <romieu@fr.zoreil.com>
To: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Peter Hurley <peter@hurleysoftware.com>,
Eric Dumazet <edumazet@google.com>,
David Miller <davem@davemloft.net>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Greg KH <gregkh@linuxfoundation.org>,
dmaengine@vger.kernel.org,
John Ogness <john.ogness@linutronix.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: Softirq priority inversion from "softirq: reduce latencies"
Date: Sun, 28 Feb 2016 18:01:09 +0100 [thread overview]
Message-ID: <20160228170109.GA16322@electric-eye.fr.zoreil.com> (raw)
In-Reply-To: <1456638957.3676.12.camel@gmail.com>
Mike Galbraith <umgwanakikbuti@gmail.com> :
[...]
> Hrm, relatively new + tasklet woes rings a bell. Ah, that..
>
> <quote>
> What's worse is that at the point where this code was written it was
> already well known that tasklets are a steaming pile of crap and
> should die.
> </quote>
>
> Source thereof https://lwn.net/Articles/588457/
tasklets are ingrained in the dmaengine API (see Documentation/dmaengine/client.txt
and drivers/dma/virt-dma.h::vchan_cookie_complete).
Moving everything to irq context or handling his own sub-{jiffy/ms} timer
while losing async dma doesn't exactly smell like roses either. :o(
--
Ueimor
next prev parent reply other threads:[~2016-02-28 17:01 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-27 18:19 Peter Hurley
2016-02-27 20:13 ` Eric Dumazet
2016-02-27 20:29 ` Peter Hurley
2016-02-27 23:04 ` David Miller
2016-02-27 23:33 ` Peter Hurley
2016-02-28 1:59 ` Eric Dumazet
2016-02-28 2:10 ` Peter Hurley
2016-02-28 2:17 ` Eric Dumazet
2016-02-28 4:46 ` David Miller
2016-02-28 5:55 ` Mike Galbraith
2016-02-28 17:01 ` Francois Romieu [this message]
2016-02-29 4:58 ` Mike Galbraith
2016-02-29 15:03 ` Peter Hurley
2016-02-29 15:19 ` Eric Dumazet
2016-02-29 15:54 ` Peter Hurley
2016-02-29 16:21 ` Eric Dumazet
2016-02-29 18:05 ` Peter Hurley
2016-02-29 18:24 ` Eric Dumazet
2016-02-29 18:53 ` Peter Hurley
2016-02-29 19:14 ` Thomas Gleixner
2016-02-29 20:24 ` David Miller
2016-02-29 23:04 ` Peter Hurley
2016-02-29 15:27 ` Eric Dumazet
2016-02-29 19:13 ` Peter Hurley
2016-02-29 19:43 ` Eric Dumazet
2016-02-29 15:40 ` Mike Galbraith
2016-02-29 15:58 ` Peter Hurley
2016-02-29 16:24 ` Eric Dumazet
2016-02-29 17:16 ` David Miller
2016-03-07 15:31 ` Sebastian Andrzej Siewior
2016-03-07 17:06 ` Mike Galbraith
2016-03-07 15:48 ` Sebastian Andrzej Siewior
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