DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0983B205C9
MIME-Version: 1.0
References: <CAK8U23bW5ov=FfD0xBnio7FwS9NTjoyewfHWZhHAmZNPsA16Jw@mail.gmail.com>
 <a88ba8b1e23b5e461f492f050cfd67c0222cf662.camel@sipsolutions.net>
 <CAK8U23Yi-wa0yT_K2eazTBEsVH3kmYHpZEeMmoDEAdyamdSTqA@mail.gmail.com>
 <7adcf11c634f31032eaac3c15f8d92b366f14477.camel@sipsolutions.net>
 <CAK8U23a8CMgNboStufh7kVpKSE9URkniWkpeNXi2hr1D3GunZQ@mail.gmail.com>
 <4fa8dc82a0c64bc5521fd0aacaa9bf951984d81e.camel@sipsolutions.net> <CAK8U23Y_xFK7ajBbTJ0kWKZnhdEkmRgd=9kmfcB1sztNyHxHEQ@mail.gmail.com>
In-Reply-To: <CAK8U23Y_xFK7ajBbTJ0kWKZnhdEkmRgd=9kmfcB1sztNyHxHEQ@mail.gmail.com>
From:   Ramon Fontes <ramonreisfontes@gmail.com>
Date:   Thu, 22 Nov 2018 09:18:49 -0300
Message-ID: <CAK8U23Z5yQLwxjkoa516fW532Z7pO0vkRv=M9iqp4CcPDkUuYw@mail.gmail.com>
Subject: Re: mac80211_hwsim: multiple antennas
To:     Johannes Berg <johannes@sipsolutions.net>
Cc:     linux-wireless@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

I've tested the same setup with adhoc and the throughput seems to be
higher as expected. Thus, the problem comes up when I use hostapd.

I noticed that the maximum supported rate by hostapd (legacy) is 54Mbps.
Extended supported rates: 24.0 36.0 48.0 54.0

Then I tried to modify mac80211_hwsim in order to provide more rates
and it didn't work:
Extended supported rates: 24.0 36.0 48.0 54.0 54.0 54.0 54.0

The maximum supported rate is always 54Mbps.

Then I found the Beacon frame TX rate configuration from hostapd.conf.
After trying to enable the beacon rate (e.g. beacon_rate=3Dht:1) I got
the following msg:
ap1-wlan1: interface state UNINITIALIZED->HT_SCAN
Using interface ap1-wlan1 with hwaddr 02:00:00:00:02:00 and ssid "ssid-ap1"
nl80211: Driver does not support setting Beacon frame rate (HT)

and hostapd doesn't work.

Could this problem be related to mac80211_hwsim?

Em qua, 21 de nov de 2018 =C3=A0s 10:09, Ramon Fontes
<ramonreisfontes@gmail.com> escreveu:
>
> Yes. I thought that it could be related to the number of antennas (or
> something else) after seeing this result
> (https://bobcopeland.com/blog/2014/09/wmediumd-speed-test/) provided
> by wmediumd.
> Em qua, 21 de nov de 2018 =C3=A0s 09:48, Johannes Berg
> <johannes@sipsolutions.net> escreveu:
> >
> > On Wed, 2018-11-21 at 09:47 -0300, Ramon Fontes wrote:
> > > Okay! Thanks a lot.
> > >
> > > Indeed, the maximum throughput when using only hwsim is in the order =
of Gbp/s.
> >
> > So I guess the question is where it's going wrong - is it the wmediumd
> > overhead (netlink), some air simulation in wmediumd, etc.
> >
> > johannes
> >