From: "David S. Miller" <davem@redhat.com>
To: Marko Rauhamaa <marko@pacujo.net>
Cc: kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org,
hadi@cyberus.ca, Robert.Olsson@data.slu.se
Subject: Re: NAPI Race?
Date: Wed, 8 Oct 2003 14:31:21 -0700 [thread overview]
Message-ID: <20031008143121.1efdd19d.davem@redhat.com> (raw)
In-Reply-To: <m3ekxnzaxg.fsf@lumo.pacujo.net>
On 08 Oct 2003 14:17:31 -0700
Marko Rauhamaa <marko@pacujo.net> wrote:
> But do_softirq() explicitly refuses to run
> the same softirq right away.
Check current 2.6.x sources, it does loop a certain number of times
even for the same softirq type.
> Well, it almost does. You can blast a NAPI driver with a packet flood,
> and the system is happy and responsive -- no interrupts are generated,
> and packets are polled by ksoftirqd. However, you can find a packet rate
> that will cause the CPU to spend virtually all of its time in NAPI.
This situation can be created with non-NAPI drivers too.
Alexey is trying to explain to you what the true cause of the
problem is, and it's not NAPI, it's softirq starvation.
prev parent reply other threads:[~2003-10-08 21:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-08 3:07 NAPI Race? Marko Rauhamaa
2003-10-08 11:34 ` P
2003-10-08 19:57 ` kuznet
2003-10-08 21:17 ` Marko Rauhamaa
2003-10-08 21:31 ` David S. Miller [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20031008143121.1efdd19d.davem@redhat.com \
--to=davem@redhat.com \
--cc=Robert.Olsson@data.slu.se \
--cc=hadi@cyberus.ca \
--cc=kuznet@ms2.inr.ac.ru \
--cc=linux-kernel@vger.kernel.org \
--cc=marko@pacujo.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox