From: "Jose Núñez-Martínez (CTTC)" <jose.nunez@cttc.cat>
To: "Iñaki Pascual" <ipascual@cttc.cat>, ath10k@lists.infradead.org
Subject: Re: high RTT in 40 MHz channel width
Date: Sat, 30 Apr 2016 18:39:23 +0200 [thread overview]
Message-ID: <5724DFBB.7000208@cttc.cat> (raw)
In-Reply-To: <5723960B.9040404@cttc.cat>
Hi all,
just to clarify, results are ms. And stations are in IBSS mode.
BW 20 MHz: TCP 0.9ms UDP 1.1ms
BW 40 MHz: TCP 7.7ms UDP 1.3ms
BW 80 MHz: TCP 3.5ms UDP 1.3ms
Behavior with 40MHz and 80MHz channel bandwidth is really weird taking
into account there are no retransmissions. Anyone facing this kind of
problem?
Thanks,
Jose
On 04/29/2016 07:12 PM, Iñaki Pascual wrote:
> Hi,
>
> I am measuring TCP and UDP latency (actually RTT) and I am getting too
> high values when working with channels with 40MHz (also with 80MHz)
> width.
>
> I am using hping3 for testing and these are the RTT avg values:
>
> BW 20 MHz: TCP 0.9 UDP 1.1
> BW 40 MHz: TCP 7.7 UDP 1.3
> BW 80 MHz: TCP 3.5 UDP 1.3
>
> I have tried different channels with similar results. According hping
> there are no packet loss and with wireshark I don't see any
> retransmission.
>
> I am using:
> driver: ath10k_pci
> version: 4.2.0+
> firmware-version: 10.1.467-ct-com-full-014-96d543
>
> Any ideas?
>
> Bests,
>
> Iñaki
>
> _______________________________________________
> ath10k mailing list
> ath10k@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/ath10k
--
Jose Núñez-Martínez, PhD
Senior Researcher email: jose.nunez@cttc.cat
COMNET Division Web: http://networks.cttc.cat
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Parc Mediterrani de la Tecnologia
Av. Carl Friedrich Gauss, 7 Ph.:+34 936452927
08860 Castelldefels - Barcelona Fax: +34 936452901
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next prev parent reply other threads:[~2016-04-30 16:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-29 17:12 high RTT in 40 MHz channel width Iñaki Pascual
2016-04-30 16:39 ` Jose Núñez-Martínez (CTTC) [this message]
2016-04-30 16:50 ` Ben Greear
2016-05-05 10:36 ` Iñaki Pascual
2016-05-05 10:47 ` Michal Kazior
2016-05-05 11:05 ` Iñaki Pascual
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