From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-x22b.google.com (mail-ob0-x22b.google.com [IPv6:2607:f8b0:4003:c01::22b]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 68E9121F807 for ; Fri, 26 Jun 2015 10:04:56 -0700 (PDT) Received: by obbop1 with SMTP id op1so70720877obb.2 for ; Fri, 26 Jun 2015 10:04:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=JG/Yvr9aht8OhHBbP/d+PhRBCSi4g+1Qfb/fA1Z77+Q=; b=uaFAI3kDFgo0NKRaiNA5FC0NJDGVJRy6v7dDLiNAqdfzGQsanNoM0qJa1ZJrBlxzT+ xQzP9w21AzCdXOrjw11Q7AvFtv43pfNunma8HRvs0fgMs+mBQn8GxR8iNIh7GXyNDQ1H NgzTo7cB+7GF/WjV71Dhhbzns5HmF9I0WN6Z4aF+aMbYCLuCOlw1jy3CDZv3awzVPMa0 zRRaEmp39jkDLGuPJqitwe/JXPTDpawq5pHxEZDYhigMOmnR0Rz319j1NHIrpRIdmPLZ SCR5jlxRizecj77yI6l3LH8sAC9L9J2QRMSJPYCBRQf2XyWNjVy1o88aC6Je3S18S8k5 HC8g== MIME-Version: 1.0 X-Received: by 10.202.91.212 with SMTP id p203mr2251768oib.108.1435338296192; Fri, 26 Jun 2015 10:04:56 -0700 (PDT) Received: by 10.202.105.129 with HTTP; Fri, 26 Jun 2015 10:04:56 -0700 (PDT) In-Reply-To: References: <55847E32.9000405@gmail.com> <5584823E.4040207@gmail.com> <0129B5FB-9D1B-45FF-84CA-492A6A0B638B@gmx.de> <43D5C3CE-F1F4-4BA5-AEB9-55348661C7BA@gmx.de> Date: Fri, 26 Jun 2015 10:04:56 -0700 Message-ID: From: Dave Taht To: Jonathan Morton Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: "cerowrt-devel@lists.bufferbloat.net" Subject: Re: [Cerowrt-devel] performance numbers from WRT1200AC (Re: Latest build test - new sqm-scripts seem to work; "cake overhead 40" didn't) X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Jun 2015 17:05:25 -0000 On Fri, Jun 26, 2015 at 9:35 AM, Jonathan Morton wr= ote: > These would be hardware tail drops - there might not be a physical counte= r > recording them. But you could instrument three driver to see whether the > receive buffer is full when serviced. from drivers/net/ethernet/marvel/mvneta.c: /* Max number of Rx descriptors */ #define MVNETA_MAX_RXD 128 this is probably too small, especially given the 64 it is willing to wait for. At the same time, it is too large, as there are 8 hardware queues in play here. So you get a huge burst from one flow, it gros it all together.... aggghh... /* Max number of Tx descriptors */ #define MVNETA_MAX_TXD 532 this realllllly needs BQL. Same problem(s). Only worse. > > - Jonathan Morton > > > _______________________________________________ > Cerowrt-devel mailing list > Cerowrt-devel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cerowrt-devel > --=20 Dave T=C3=A4ht worldwide bufferbloat report: http://www.dslreports.com/speedtest/results/bufferbloat And: What will it take to vastly improve wifi for everyone? https://plus.google.com/u/0/explore/makewififast