From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-x244.google.com (mail-it0-x244.google.com [IPv6:2607:f8b0:4001:c0b::244]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 865F53B260 for ; Tue, 19 Jul 2016 05:26:08 -0400 (EDT) Received: by mail-it0-x244.google.com with SMTP id d65so1040788ith.0 for ; Tue, 19 Jul 2016 02:26:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=3IKvCaKpeK3vH0dll4QguOEYjCKKamtTDXs8FHU+PqU=; b=1D9Qw5tjWp9gzxefGUPdIEb+cwuF0q/2iYt9BpWm0apgX6owx4PxsZMDK3UGDlpK+A +wFrZfFKHdFRLu9+HWBvH6ylck6XWL7wuaH7sp3c5cxEd7NXtYtlalVd3noA10SdT7G8 XQllnZp82q3r/t0xpb415Ot3Vl4nS+YdnbbrdtyPND7Zu1ma5oAjp2AOoW5Z+NaJPrdh Rlco6iohL8+Dcf4uDOewb9hs168Y/h5bBsgSDsvtKuNrD+Ad4QaBM38O4qqY774n8bNy 78srznFOAJIyxlCbCzrBBVn9zjLUBoPAQ1Klo4USlzkKgsrwpmhsdbBQ/4gL+zkCj/2i /DiA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=3IKvCaKpeK3vH0dll4QguOEYjCKKamtTDXs8FHU+PqU=; b=e1FSLzCmt+qFTOu1oJoJBw07EznEhM+eg6tmDN26wJAH4+emZe6yDMD1arAwsZLF3G /Ry8ssDL2jDiJOnquBKxaTVUIH/IeKBF3Too1H3JXB/g1OfODH5fFmD4IG1diPDsS2M3 d7yQjnY1QoPFaBCsWcXcOkGVrjmgoGC2dtMhcsZNQ6krqRROyRPWdMgYmXk+aHIP83BH R8r4MP9GiRgvYH26jjFEArqSnukhBQ+wtsLMPFNbhamwSczEE4nptXPEUpYMOTZN32EA Ush6tZnqFVuC8klGjIkWgOnkPGEa4JMAZPMThtgQ6/pscg6BMN6XfAmT2III1EP5krwY rcBw== X-Gm-Message-State: ALyK8tLKIomSWlC8nkB9XqhMhNpVZ7S2HBct6quh/xxCwigEGjA88EugOZsmMEKi7qpW2Y19++cTUxDfrReiRQ== X-Received: by 10.36.196.65 with SMTP id v62mr2711479itf.78.1468920367906; Tue, 19 Jul 2016 02:26:07 -0700 (PDT) MIME-Version: 1.0 Received: by 10.79.14.17 with HTTP; Tue, 19 Jul 2016 02:26:07 -0700 (PDT) In-Reply-To: References: From: Dave Taht Date: Tue, 19 Jul 2016 02:26:07 -0700 Message-ID: To: Neil Shepperd Cc: cake@lists.bufferbloat.net Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Subject: Re: [Cake] when did rack enter the kernel? X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 Jul 2016 09:26:08 -0000 On Mon, Jul 18, 2016 at 5:05 PM, Neil Shepperd wrote: > October 2015: > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?i= d=3Deb9fae328faff9807a4ab5c1834b19f34dd155d4 > > Sounds like the speed up is pretty subtle, so I'm not surprised I didn't > notice... It is not so much the speed ups in loss recovery in rack that are concerning me, it is the impact on congestion avoidance (which is sort of undefined in the ietf draft). I have been observing a dramatic decline in observed packet loss and a sluggishness in grabbing newly available bandwidth - as well as oddities when congestion avoidance is hit after exiting slow start. I was looking at traces and not seeing the window open up at all... even with reno... as well as one where I was seeing queues drain completely and a loss of utilization at 10mbit in cake. Regrettably I have so many different pieces in flight (cake, wifi device drivers, now this) that taking a few steps back to look at the issues seems to be needed. Are we really tracking dropped packets correctly? So I can add a new one - What happens if I disable rack and/or test with an older kernel? > On Mon, 18 Jul 2016 at 05:05 Dave Taht wrote: >> >> https://www.ietf.org/proceedings/96/slides/slides-96-tcpm-3.pdf >> >> -- >> Dave T=C3=A4ht >> Let's go make home routers and wifi faster! With better software! >> http://blog.cerowrt.org >> _______________________________________________ >> Cake mailing list >> Cake@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/cake --=20 Dave T=C3=A4ht Let's go make home routers and wifi faster! With better software! http://blog.cerowrt.org