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[108.168.58.21]) by smtp.gmail.com with ESMTPSA id o17sm1561199qtq.93.2020.01.29.11.48.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 29 Jan 2020 11:48:45 -0800 (PST) Message-ID: <1580327314.26012.59.camel@gmail.com> Subject: Re: Strange performance issue when using two devices at once From: Marlon Smith To: Ben Greear , linux-wireless@vger.kernel.org Date: Wed, 29 Jan 2020 14:48:34 -0500 In-Reply-To: <6bcff97c-3b9b-7fa9-5101-80aca367ff84@candelatech.com> References: <1580323191.26012.48.camel@gmail.com> <2e80a485-892d-3b29-19c7-38a9caa14f4b@candelatech.com> <1580325769.26012.54.camel@gmail.com> <6bcff97c-3b9b-7fa9-5101-80aca367ff84@candelatech.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org On Wed, 2020-01-29 at 11:27 -0800, Ben Greear wrote: > On 1/29/20 11:22 AM, Marlon Smith wrote: > > > > On Wed, 2020-01-29 at 10:42 -0800, Ben Greear wrote: > > > > > > On 1/29/20 10:39 AM, Marlon Smith wrote: > > > > > > > > > > > > Hi everyone, > > > > > > > > I have two RT5370 devices connected to the same access point. > > > > Both > > > > devices are very slow, but the instant I disconnect one device, > > > > the > > > > other speeds up by a factor of 10. > > > Out of curiosity, are both of the RT5370 used on the same client > > > device? > > > > > > > > Did you check that they have unique MAC addresses? > > > > Thanks, > > > Ben > > > > > > > > > > > > > > > > > > The really strange part is that one device will perform slowly > > > > even > > > > if > > > > the other device is basically idle! I've confirmed this with a > > > > packet > > > > sniffer. > > > > > > > > I've been trying to do some debugging, and I've found that when > > > > both > > > > devices are connected to the access point, they report a large > > > > number > > > > of duplicate frames. I added some debug output > > > > in ieee80211_rx_h_check_dup() to confirm that this only happens > > > > while > > > > both devices are connected. The packet sniffer also shows a > > > > large > > > > number of retries while this is occurring. > > > > > > > > Using backports 5.3-rc4 for this, but also tested on 4.14-rc2. > > > > > > > > I did post about this previously on this mailing list (RT5370 > > > > performance issues), but I thought I'd post again with this new > > > > information and more descriptive title. I'm a little bit stuck > > > > on > > > > this > > > > for a while now, so any ideas are much appreciated. > > > > > > > > Thanks! > > > > > > > > Marlon > > > > > > They are on separate devices, although the mac addresses are close. > > 70:F1:1C:2E:AF:B4 and > > 70:F1:1C:2E:AF:B6. > > > > However, I have a third device 70:F1:1C:2E:AF:BB which performs > > well > > and does not affect the performance of the other two. > > > Have you tried a different AP? > > And also tried using the exact same MAC addresses configured on a > different > radio (like ath9k)? > > Thanks, > Ben > > I have tried a different access point in a different environment but no luck. I'll see if I can configure my laptop to use one of the problematic devices' mac address.