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Message-ID: <1432760563.15971.37.camel@redhat.com> (sfid-20150527_230247_885849_B19C6138)
Subject: Re: packet loss, disconnects and possible bug in iwlwifi
From: Dan Williams <dcbw@redhat.com>
To: Nick Dimov <dimovnike@gmail.com>
Cc: Emmanuel Grumbach <egrumbach@gmail.com>,
	linux-wireless <linux-wireless@vger.kernel.org>
Date: Wed, 27 May 2015 16:02:43 -0500
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On Wed, 2015-05-27 at 22:46 +0300, Nick Dimov wrote:
> Hello everyone.
> I updated the regulatory database from here
> https://www.kernel.org/pub/software/network/wireless-regdb/ (just copied
> the regulatory.bin and the public key) and the problem is gone! Thank to
> all of you and especially to Emmanuel Grumbach for suggesting this.
> 
> Now another question - how to make it connect at 866mbps or at least
> something close to it? Any ideas?

iwlwifi does dynamic rate scaling, so you'll almost never see 866mbps.
When traffic is idle it drops back to 1mbit rates and then when traffic
starts, scales up from there.  Also, I'm pretty sure you'll never get
866mbps in the 2.4GHz band due to lack of bandwidth there, you'll have
to go 5GHz for that.

Use "iw dev <ifname> link" to see the current rate.

Dan

> Thanks you,
> Nick.
> 
> On 27.05.2015 21:34, Emmanuel Grumbach wrote:
> > On Wed, May 27, 2015 at 6:55 PM, Dan Williams <dcbw@redhat.com> wrote:
> >> On Wed, 2015-05-27 at 02:44 +0300, Nick Dimov wrote:
> >>> Hello,
> >>> thank you for your response. I attach the full syslog since the last
> >>> boot which contains some disconnects. I enabled debug mode for
> >>> wpa_supplicant with -dd option (let me know if you need anything else).
> >>>
> >>> I also tried connecting directly, i.e. without NetworkManager but
> >>> manually with wpa_supplicant and I still get disconnects, howvever
> >>> wpa_supplicant gives different logs with different drivers. Please, see
> >>> the file wifi.log (you can see there the driver i used in
> >>> wpa_supplicant, that log doesn't have the debug activated but let me
> >>> know if you need that too)
> >> So if NM isn't involved in your later runs (and it's not, looking at the
> >> logs), then I'm not sure what the issue could be except something in the
> >> driver.
> >>
> >> mai 27 02:31:54 nick-G55VW wpa_supplicant[1565]: nl80211: Event message
> >> available
> >> mai 27 02:31:54 nick-G55VW wpa_supplicant[1565]: nl80211: Drv Event 20
> >> (NL80211_CMD_DEL_STATION) received for wlan5
> >> mai 27 02:31:54 nick-G55VW wpa_supplicant[1565]: nl80211: Delete station
> >> d8:50:e6:da:1d:b4
> >> mai 27 02:31:54 nick-G55VW kernel: wlan5: deauthenticating from
> >> d8:50:e6:da:1d:b4 by local choice (Reason: 3=DEAUTH_LEAVING)
> >>
> >> I don't see anything interesting around those lines, so I guess its up
> >> to Emmanuel now...  the tracing he requests would be good to get.
> >>
> > I suspect a regulatory problem. This is why I asked what was the
> > channel used on 2.4GHz. On 5.2GHz we have seen bugs happening because
> > of the regulatory database being ancient on Ubuntu. 2.4GHz should rule
> > these problems out, unless we are talking about channel 12 and up or
> > something like that.
> 
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