From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yh0-x234.google.com (mail-yh0-x234.google.com [IPv6:2607:f8b0:4002:c01::234]) (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 3D62821F184; Wed, 18 Mar 2015 15:22:49 -0700 (PDT) Received: by yhle43 with SMTP id e43so7515006yhl.2; Wed, 18 Mar 2015 15:22:48 -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; bh=Su2jiqbxGz3vaRKsQ6MWFBLKil07kqXEytq9blxUXa4=; b=1AmxfyyzJUKiuAISTbtVsxLWz/sSHEYbmn4nJ1oJprcHdYVUCsUiI2QstedWzpi4/4 LtcJ6M35rkkvmTI7et9vYy3U2yNefwd15ek1O2jMw4dpUb9aDKYAnAI4pei2F7q4awel 2J3KJzkkX1LPP1ldwrti8X13Nh4u9STtuhJ+rNP4WUwdDXoP1RPB52Fx/so1N3yM0hw/ luR/yhXQuiAdzU87NQ6RGHmIPb49G3Qe3SmnmmXRgyQWdp49m13JiEUqrFEEsVqqMeUA jcHGyguAvsm3LkPuiWb4PXeEIlU7hhkSb4ObT/EcCtV8D6EGslHgWmQI1p0wZyoFW81t Tcfg== MIME-Version: 1.0 X-Received: by 10.52.160.69 with SMTP id xi5mr20483987vdb.58.1426717368630; Wed, 18 Mar 2015 15:22:48 -0700 (PDT) Received: by 10.52.240.145 with HTTP; Wed, 18 Mar 2015 15:22:48 -0700 (PDT) Received: by 10.52.240.145 with HTTP; Wed, 18 Mar 2015 15:22:48 -0700 (PDT) In-Reply-To: References: Date: Thu, 19 Mar 2015 00:22:48 +0200 Message-ID: From: Jonathan Morton To: Dave Taht Content-Type: multipart/alternative; boundary=089e0160c514f3c4fc05119785f9 Cc: codel@lists.bufferbloat.net, cerowrt-devel@lists.bufferbloat.net Subject: Re: [Cerowrt-devel] hires timer dependency? 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: Wed, 18 Mar 2015 22:23:18 -0000 --089e0160c514f3c4fc05119785f9 Content-Type: text/plain; charset=UTF-8 Yes, I recognise that behaviour from when I didn't have the timer resolution workaround in cake. The PowerBook was fine (modern hardware, good timers) but the Pentium-MMX only has the basic PC-AT timer hardware, operating at 1kHz. Because ack packets end up spaced the same way, it affects download as well at a multiple of the upload effect bandwidth, even if download is not shaped. The multiple depends on how the receiving host spaces acks. - Jonathan Morton --089e0160c514f3c4fc05119785f9 Content-Type: text/html; charset=UTF-8

Yes, I recognise that behaviour from when I didn't have the timer resolution workaround in cake. The PowerBook was fine (modern hardware, good timers) but the Pentium-MMX only has the basic PC-AT timer hardware, operating at 1kHz.

Because ack packets end up spaced the same way, it affects download as well at a multiple of the upload effect bandwidth, even if download is not shaped. The multiple depends on how the receiving host spaces acks.

- Jonathan Morton

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