From: Frederic Weisbecker <frederic@kernel.org>
To: David Miller <davem@davemloft.net>
Cc: torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
alexander.levin@verizon.com, peterz@infradead.org,
mchehab@s-opensource.com, hannes@stressinduktion.org,
paulmck@linux.vnet.ibm.com, wanpeng.li@hotmail.com,
dima@arista.com, tglx@linutronix.de, akpm@linux-foundation.org,
pabeni@redhat.com, rrendec@arista.com, mingo@kernel.org,
sgruszka@redhat.com, riel@redhat.com, edumazet@google.com
Subject: Re: [RFC PATCH 1/4] softirq: Limit vector to a single iteration on IRQ tail
Date: Sun, 21 Jan 2018 17:30:09 +0100 [thread overview]
Message-ID: <20180121163008.GB2879@lerouge> (raw)
In-Reply-To: <20180119.134727.512994648781037639.davem@davemloft.net>
On Fri, Jan 19, 2018 at 01:47:27PM -0500, David Miller wrote:
> From: Linus Torvalds <torvalds@linux-foundation.org>
> Date: Fri, 19 Jan 2018 10:25:03 -0800
>
> > On Fri, Jan 19, 2018 at 8:16 AM, David Miller <davem@davemloft.net> wrote:
> >>
> >> So this "get requeued" condition I think will trigger always for
> >> networking tunnel decapsulation.
> >
> > Hmm. Interesting and a perhaps bit discouraging.
> >
> > Will it always be just a _single_ level of indirection, or will double
> > tunnels (I assume some people do that, just because the universe is
> > out to get us) then result in this perhaps repeating several times?
>
> Every level of tunnel encapsulation will trigger a new softirq.
>
> So if you have an IP tunnel inside of an IP tunnel that will trigger
> twice.
So we may likely need to come back to a call counter based limit :-s
next prev parent reply other threads:[~2018-01-21 16:30 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-19 15:46 [RFC PATCH 0/4] softirq: Per vector threading v3 Frederic Weisbecker
2018-01-19 15:46 ` [RFC PATCH 1/4] softirq: Limit vector to a single iteration on IRQ tail Frederic Weisbecker
2018-01-19 16:16 ` David Miller
2018-01-19 18:25 ` Linus Torvalds
2018-01-19 18:47 ` David Miller
2018-01-21 16:30 ` Frederic Weisbecker [this message]
2018-01-21 16:57 ` David Miller
2018-01-19 15:46 ` [RFC PATCH 2/4] softirq: Per vector deferment to workqueue Frederic Weisbecker
2018-01-20 8:41 ` Pavan Kondeti
2018-01-21 16:11 ` Frederic Weisbecker
2018-01-21 17:50 ` Pavan Kondeti
2018-01-21 20:48 ` Frederic Weisbecker
2018-02-08 17:44 ` Sebastian Andrzej Siewior
2018-02-08 18:45 ` David Miller
2018-02-08 20:14 ` Dmitry Safonov
2018-02-08 20:22 ` David Miller
2018-02-08 20:30 ` Dmitry Safonov
2018-02-09 4:11 ` Mike Galbraith
2018-02-09 12:35 ` Sebastian Andrzej Siewior
2018-02-15 16:13 ` Frederic Weisbecker
2018-02-15 16:58 ` Sebastian Andrzej Siewior
2018-01-19 15:46 ` [RFC PATCH 3/4] softirq: Defer to workqueue when rescheduling is needed Frederic Weisbecker
2018-01-19 15:46 ` [RFC PATCH 4/4] softirq: Replace ksoftirqd with workqueues entirely Frederic Weisbecker
2018-01-22 19:58 ` [RFC PATCH 0/4] softirq: Per vector threading v3 Mauro Carvalho Chehab
2018-01-23 10:13 ` Paolo Abeni
2018-01-23 12:32 ` Dmitry Safonov
2018-01-24 2:12 ` Frederic Weisbecker
2018-01-23 16:22 ` David Miller
2018-01-23 16:57 ` Paolo Abeni
2018-01-23 17:42 ` Linus Torvalds
2018-01-23 18:01 ` Mike Galbraith
2018-01-23 18:24 ` David Miller
2018-01-24 1:57 ` Frederic Weisbecker
2018-01-24 2:01 ` Frederic Weisbecker
2018-01-24 14:54 ` Paolo Abeni
2018-01-24 15:05 ` David Miller
2018-01-24 16:11 ` Paolo Abeni
2018-02-07 14:18 ` Mauro Carvalho Chehab
2018-03-01 15:21 ` Frederic Weisbecker
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