Return-path: Received: from mail-ua1-f45.google.com ([209.85.222.45]:44968 "EHLO mail-ua1-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727608AbeIIA6i (ORCPT ); Sat, 8 Sep 2018 20:58:38 -0400 Received: by mail-ua1-f45.google.com with SMTP id m11-v6so14441569uao.11 for ; Sat, 08 Sep 2018 13:11:43 -0700 (PDT) MIME-Version: 1.0 From: Nikolay Martynov Date: Sat, 8 Sep 2018 16:11:31 -0400 Message-ID: (sfid-20180908_221147_185245_EB6F0197) Subject: QCA988X firmware version and performance To: linux-wireless , ath10k@lists.infradead.org, Kalle Valo , kavitam@cdot.in Content-Type: text/plain; charset="UTF-8" Sender: linux-wireless-owner@vger.kernel.org List-ID: Hi. I've got some observation about firmware version and speed that I would like to share. I have tp-link archer c5 with 'ath10k_pci 0000:01:00.0: qca988x hw2.0 target 0x4100016c chip_id 0x043202ff sub 0000:0000' running Openwrt. When I use firmware version 10.2.4.70.61-2 I get modulation speeds about twice as large as with other firmware versions. I've also tried 10.2.4.70.66 and firmware-5.bin_10.2.4-1.0-00033 and one that was Openwrt/Lede stock before that - all show performance noticeably worse than 10.2.4.70.61-2. In fact if my laptop stands on my desk (some distance away from AP) and I use 10.2.4.70.61-2 I get stable 2 spacial stream reception, if I use other versions mentioned above I usually get one 1 special stream as shown by 'iw' command on a client. I've also perfomed some speed measurements with iperf: * with latest firmware I get 30MB/s and iw on a client shows signal strength of -72dBm * with 10.2.4.70.61-2I get 53MB/s and iw on a client shows signal strength of -63dBm All with laptop (client) unmoved. So it looks like downgrading firmware gains 30+% performance. I've already tried to raise this question ~8 months ago but didn't get any reply. It seems like this is a bug in newer versions of firmware and it would be really nice if that bug could be fixed. Is there any way I can help with that? Maybe someone could provide me with better channel to ask these questions? Please let me know if I can provide any more information. Thanks! -- Martynov Nikolay. Email: mar.kolya@gmail.com