From: Jesper Dangaard Brouer <brouer@redhat•com>
To: Dave Taht <dave.taht@gmail•com>
Cc: "Eric Dumazet" <eric.dumazet@gmail•com>,
"Alexander Duyck" <alexander.duyck@gmail•com>,
"Hannes Frederic Sowa" <hannes@stressinduktion•org>,
"John Fastabend" <john.r.fastabend@intel•com>,
"Jamal Hadi Salim" <jhs@mojatatu•com>,
"Daniel Borkmann" <dborkman@redhat•com>,
"Florian Westphal" <fw@strlen•de>,
"netdev@vger•kernel.org" <netdev@vger•kernel.org>,
"Toke Høiland-Jørgensen" <toke@toke•dk>,
"Tom Herbert" <therbert@google•com>,
"David Miller" <davem@davemloft•net>,
brouer@redhat•com
Subject: Re: Network optimality (was Re: [PATCH net-next] qdisc: validate skb without holding lock_
Date: Mon, 13 Oct 2014 22:27:17 +0200 [thread overview]
Message-ID: <20141013222717.42f3c399@redhat.com> (raw)
In-Reply-To: <CAA93jw5MKVaNaObVD3Lm=DP0ie6HcjwOvt0X-whDLJD_6hF5bw@mail.gmail.com>
On Mon, 13 Oct 2014 10:20:17 -0700 Dave Taht <dave.taht@gmail•com> wrote:
> On Mon, Oct 13, 2014 at 9:58 AM, Eric Dumazet <eric.dumazet@gmail•com> wrote:
> >
> >> On Oct 13, 2014 7:22 AM, "Dave Taht" <dave.taht@gmail•com> wrote:
[...]
>
> I would like to also get better behavior out of gigE and below, and for
> these changes to not impact the downstream behavior of the network
> overall.
I also care about 1Gbit/s and below, that why I did some many tests
(with igb at 10Mbit/s, 100Mbit/s and 1Gbit/s).
> To give you an example, I would like to see the tcp flows in the
> 2nd chart here, to converge faster than the 5 seconds they currently
> take at GigE speeds.
>
> http://snapon.lab.bufferbloat.net/~cero2/nuc-to-puck/results.html
In the last graph, where you cannot saturate the link, because you
turned off GSO, GRO and TSO. Here I expect you will see the benefit of
the qdisc bulking. That is, will be able to saturate the link and
achieve the lower latency as BQL will cut off the bursts at +1 MTU.
I would be interested in the results...
> > We made all these changes so that we can spend cpu cycles at the right
> > place.
Exactly.
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Sr. Network Kernel Developer at Red Hat
Author of http://www.iptv-analyzer.org
LinkedIn: http://www.linkedin.com/in/brouer
next prev parent reply other threads:[~2014-10-13 20:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-13 14:22 Network optimality (was Re: [PATCH net-next] qdisc: validate skb without holding lock_ Dave Taht
[not found] ` <CAL4WiioOodM60_Ud6qyGt1_uyeqpDeGFF6PtEKtGa=NwHhVFiw@mail.gmail.com>
2014-10-13 16:58 ` Eric Dumazet
2014-10-13 17:20 ` Dave Taht
2014-10-13 17:43 ` Tom Herbert
2014-10-13 20:27 ` Jesper Dangaard Brouer [this message]
2014-10-13 20:47 ` Dave Taht
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=20141013222717.42f3c399@redhat.com \
--to=brouer@redhat$(echo .)com \
--cc=alexander.duyck@gmail$(echo .)com \
--cc=dave.taht@gmail$(echo .)com \
--cc=davem@davemloft$(echo .)net \
--cc=dborkman@redhat$(echo .)com \
--cc=eric.dumazet@gmail$(echo .)com \
--cc=fw@strlen$(echo .)de \
--cc=hannes@stressinduktion$(echo .)org \
--cc=jhs@mojatatu$(echo .)com \
--cc=john.r.fastabend@intel$(echo .)com \
--cc=netdev@vger$(echo .)kernel.org \
--cc=therbert@google$(echo .)com \
--cc=toke@toke$(echo .)dk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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