From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.toke.dk (mail.toke.dk [52.28.52.200]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id B609C3B29E for ; Tue, 19 Jun 2018 07:54:48 -0400 (EDT) From: Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=toke.dk; s=20161023; t=1529409287; bh=pFjbVP84/iQzAFRnIDSur3cHcpR/HieghZJ1VYWujwo=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=WT/GdMyaGaFkZ7NICZ3E5ARvazmBYOIsQlkdSYeyKzd+DRoJzqCTSRqHzbd+S4RIM yOUKFtcQWbxqIWbvq3FM9XR5VxkibL6RG6qVoKwjnscAhQ+VMUdU1RldR8PTLCGmrz Fg66nzTJ641P85tUYrZ23m3jFuSid21uThI6S8o7c/jcBXBLlCQePTSHmFTGEfDbnT X0i3dxDuJluCZWk90wnnbttWPjU4xqzNXQfj4b8q7gdW/JKoJW3rWrma1clkqx51mE sQ9NovT6yHrcmKF7apc3BM0s/Jtx7vzC2HNNzkE4yZpddg1SNy16dxfaStUM3fWg0O FXWgDovvYzB2Q== To: Jonathan Morton Cc: Pete Heist , Cake List In-Reply-To: <0FF888EC-4FF0-4AAE-B2B8-79A10B0B5A9E@gmail.com> References: <87in6ft81g.fsf@toke.dk> <0FF888EC-4FF0-4AAE-B2B8-79A10B0B5A9E@gmail.com> Date: Tue, 19 Jun 2018 13:54:44 +0200 X-Clacks-Overhead: GNU Terry Pratchett Message-ID: <877emvt2ij.fsf@toke.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: [Cake] the Cake stalemate 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 Jun 2018 11:54:48 -0000 Jonathan Morton writes: >> On 19 Jun, 2018, at 12:55 pm, Toke H=C3=B8iland-J=C3=B8rgensen wrote: >>=20 >> Not sure there is a stalemate, actually. I just ran out of time to do >> further revisions; planning to take that up again. Don't see any reason >> why we shouldn't be able to succeed in getting Cake upstream in its >> current form(ish) in just a few more revisions (or, who knows, maybe a >> dozen more; better not jinx it ;)). > > My impression was that we were practically there - but we ran up > against a hang bug which *may* have had a root cause elsewhere than > Cake itself. I strongly suspect we're tickling a HW driver bug, but > we need someone with a different flavour of 100Gbps NIC to try (and > hopefully fail) to reproduce it. Yeah, that and getting the ACK filter approved by the TCP devs are the major outstanding issues. I'm planning to go poke at the hanging issue once I have some time, then hopefully fix whatever is causing it, and resubmit :) We also saw a bug on 32-bit MIPS where some combinations of 64-bit netlink attributes would cause stats display in tc to fail. However, I believe this is more a case of Cake exposing a latent bug somewhere in the tc or kernel netlink code (alignment issues, perhaps?), and so I'm not sure it is necessarily a blocker for merging Cake. However, if someone could take a look that would be very helpful. I forget if the current head of the cobalt branch exposes the bug, but I think it does. It's quite obvious when it happens: no stats output whatsoever... -Toke