From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from s3.sipsolutions.net ([5.9.151.49]:34017 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751356AbbASMwe (ORCPT ); Mon, 19 Jan 2015 07:52:34 -0500 Message-ID: <1421671947.1965.27.camel@sipsolutions.net> (sfid-20150119_135237_591048_8A059639) Subject: Re: brcmsmac: regression in transmit throughput since 3.19-rc1 From: Johannes Berg To: Arend van Spriel Cc: Felix Fietkau , "linux-wireless@vger.kernel.org" Date: Mon, 19 Jan 2015 13:52:27 +0100 In-Reply-To: <54BBB46C.8000401@broadcom.com> References: <54BBB46C.8000401@broadcom.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: Hi Arend, > On our nightly test setups I found that STA->AP TCP iperf showed a > regression in brcmsmac after I upgraded them from 3.18-rc5 > wireless-testing (f638577)to 3.19-rc1 wireless-testing (f9e7c6c). The > attached pictures are historic results showing clear drop on the last run. > > Has there been any report on there since 3.19-rc1 and would you have a > pointer on where to start looking. The changes in brcmsmac look trivial > so looking at mac80211 now. There are some changes in minstrel and > brcmsmac is using minstrel_ht rate control. I haven't heard of anything like that yet. No idea where to look either - but the drop is significant enough that perhaps you can bisect? johannes