From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-wi0-f169.google.com ([209.85.212.169]:40362 "EHLO mail-wi0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751004AbbBFJ6B convert rfc822-to-8bit (ORCPT ); Fri, 6 Feb 2015 04:58:01 -0500 Received: by mail-wi0-f169.google.com with SMTP id h11so1253315wiw.0 for ; Fri, 06 Feb 2015 01:58:00 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: <1422537297.21689.15.camel@edumazet-glaptop2.roam.corp.google.com> <1422628835.21689.95.camel@edumazet-glaptop2.roam.corp.google.com> <1422903136.21689.114.camel@edumazet-glaptop2.roam.corp.google.com> <1422926330.21689.138.camel@edumazet-glaptop2.roam.corp.google.com> <1422973660.907.10.camel@edumazet-glaptop2.roam.corp.google.com> <1423051045.907.108.camel@edumazet-glaptop2.roam.corp.google.com> <1423053531.907.115.camel@edumazet-glaptop2.roam.corp.google.com> <1423055810.907.125.camel@edumazet-glaptop2.roam.corp.google.com> <1423056591.907.130.camel@edumazet-glaptop2.roam.corp.google.com> <1423084303.31870.15.camel@edumazet-glaptop2.roam.corp.google.com> <1423141038.31870.38.camel@edumazet-glaptop2.roam.corp.google.com> <1423142342.31870.49.camel@edumazet-glaptop2.roam.corp.google.com> Date: Fri, 6 Feb 2015 10:57:59 +0100 Message-ID: (sfid-20150206_105811_114649_48983736) Subject: Re: Throughput regression with `tcp: refine TSO autosizing` From: Michal Kazior To: Dave Taht Cc: Eric Dumazet , Neal Cardwell , Eyal Perry , "netdev@vger.kernel.org" , linux-wireless Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: On 5 February 2015 at 20:50, Dave Taht wrote: [...] > And I really, really, really wish, that just once during this thread, > someone had bothered to try running a test > at a real world MCS rate - say MCS1, or MCS4, and measured the latency > under load of that... Time between frame submission to firmware and tx-completion on one of my ath10k machines: Legacy 54mbps: ~18ms Legacy 6mbps: ~37ms 11n MCS 3 (nss=0): ~13ms 11n MCS 8 (nss=1): ~6-8ms 11ac NSS=1 MCS=2: ~4-6ms 11ac NSS=2 MCS=0: ~5-8ms Keep in mind this is a clean room environment so retransmissions are kept at minimum. Obviously with a noisy environment you'll get retries at different rates and higher latency. Michał From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Kazior Subject: Re: Throughput regression with `tcp: refine TSO autosizing` Date: Fri, 6 Feb 2015 10:57:59 +0100 Message-ID: References: <1422537297.21689.15.camel@edumazet-glaptop2.roam.corp.google.com> <1422628835.21689.95.camel@edumazet-glaptop2.roam.corp.google.com> <1422903136.21689.114.camel@edumazet-glaptop2.roam.corp.google.com> <1422926330.21689.138.camel@edumazet-glaptop2.roam.corp.google.com> <1422973660.907.10.camel@edumazet-glaptop2.roam.corp.google.com> <1423051045.907.108.camel@edumazet-glaptop2.roam.corp.google.com> <1423053531.907.115.camel@edumazet-glaptop2.roam.corp.google.com> <1423055810.907.125.camel@edumazet-glaptop2.roam.corp.google.com> <1423056591.907.130.camel@edumazet-glaptop2.roam.corp.google.com> <1423084303.31870.15.camel@edumazet-glaptop2.roam.corp.google.com> <1423141038.31870.38.camel@edumazet-glaptop2.roam.corp.google.com> <1423142342.31870.49.camel@edumazet-glaptop2.roam.corp.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Eric Dumazet , Neal Cardwell , Eyal Perry , "netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , linux-wireless To: Dave Taht Return-path: In-Reply-To: Sender: linux-wireless-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org On 5 February 2015 at 20:50, Dave Taht wrote: [...] > And I really, really, really wish, that just once during this thread, > someone had bothered to try running a test > at a real world MCS rate - say MCS1, or MCS4, and measured the latenc= y > under load of that... Time between frame submission to firmware and tx-completion on one of my ath10k machines: Legacy 54mbps: ~18ms Legacy 6mbps: ~37ms 11n MCS 3 (nss=3D0): ~13ms 11n MCS 8 (nss=3D1): ~6-8ms 11ac NSS=3D1 MCS=3D2: ~4-6ms 11ac NSS=3D2 MCS=3D0: ~5-8ms Keep in mind this is a clean room environment so retransmissions are kept at minimum. Obviously with a noisy environment you'll get retries at different rates and higher latency. Micha=C5=82 -- To unsubscribe from this list: send the line "unsubscribe linux-wireles= s" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html