From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-x22e.google.com (mail-qt0-x22e.google.com [IPv6:2607:f8b0:400d:c0d::22e]) (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 270D13B2A4 for ; Fri, 6 Jul 2018 15:39:57 -0400 (EDT) Received: by mail-qt0-x22e.google.com with SMTP id q12-v6so10866846qtp.6 for ; Fri, 06 Jul 2018 12:39:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=e56tIv4TVUIk82rLyge4O0kiJeo9bFVqlA+7Cm7atY8=; b=ge3WOSPHHqpMD4+XU57THBBZ/72J3UhMgAFsKWyJAKrhT4TK0vZ/+yM0OSlHMR5hQm SCKDT5kRfHEl6kaxdBOA41kVl3MOcWSCXD6pmdTYQ2hI2puLm991+Lz0Z6okOvlkTfoy ghOQ0rMA9SY8zXdu4xJnf2WEbbo4nEX71j/8ewvLfyoJ5YHe+ihdJOZSBg+L9yyxDNfu X1RVAcdHqqvlUuQThV9CRHbtTYv1Ay2yKz/KwsHP5SCERlxNdE1WHR8+a8WQkGBxw540 p9KltFZOPuz6LwdbAsB2nyCFp5Sp8YRAs7y3zvUTOQoyt5ajLIgvw0DYdSu4ZmlJfMyr 82BQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=e56tIv4TVUIk82rLyge4O0kiJeo9bFVqlA+7Cm7atY8=; b=L8UFTR4tDvhAWBShicvM+nDNCrYjeLUMTflZd92XYmor4D1ovRoIcFTLeoh0o+ZPsY sK+KclfJZXfbfHXv7Konk/2RNFfMTkxgG/QSq5psfs+1PXra2dDYIfQnxGdaWB/19bIN 9VP80Xta9tP2FoIzkCn2v8FvUW/AETj99P6jU/lA+4ferxzUA1kmadjHJxlBj/SDB6Gt dlRSe/HN+1JHx+n3ORmAwQyjUs7/mXi28ErU8qxlHx9AV+bE7dq2L9ZElT0CpMRyX4L4 3chkypTkgrpyd03Lnjli4qUMvSdVFIJRYztFLuP/Vl+89Z0XclyGQOajdSlVY2Qx4Wx8 r53Q== X-Gm-Message-State: APt69E0IE6Q/HKQHBIXpKGcXcaTGAvxm0BYvxU3yN4c8jEES78OYoosY ufd9A2RIqczVZ5wrjfzDon6IocUr1xvOye9Aajc= X-Google-Smtp-Source: AAOMgpe1SNIgtDoROkCea7trcSHJ/whdJuaHGpuI1ebdYxpqTQWLQb8R11ZkNt7HQkG39T44ByiEsyWgryNHg9bZsOY= X-Received: by 2002:a0c:c345:: with SMTP id j5-v6mr9264313qvi.245.1530905996618; Fri, 06 Jul 2018 12:39:56 -0700 (PDT) MIME-Version: 1.0 References: <761C7004-247B-42B4-B56C-2527816826C7@heistp.net> <87y3eoa3wn.fsf@toke.dk> <1CFA01E7-2B3C-42C7-B102-3D0516EDCE43@heistp.net> <82EEB9CD-E441-4639-9592-A2429681EE0E@heistp.net> In-Reply-To: <82EEB9CD-E441-4639-9592-A2429681EE0E@heistp.net> From: Dave Taht Date: Fri, 6 Jul 2018 12:40:32 -0700 Message-ID: To: Pete Heist Cc: =?UTF-8?B?VG9rZSBIw7hpbGFuZC1Kw7hyZ2Vuc2Vu?= , Cake List Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: Re: [Cake] lockup with cake and veth 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: Fri, 06 Jul 2018 19:39:57 -0000 You ran out of queue to store for that rtt. netem limit 100000 or higher for that. On Fri, Jul 6, 2018 at 12:25 PM Pete Heist wrote: > > > > On Jul 6, 2018, at 3:37 PM, Pete Heist wrote: > > > > I=E2=80=99m also satisfied for now that this shouldn=E2=80=99t hold us = up. However, what I=E2=80=99ll also want to try next is netem on a separate= veth device from cake. I believe Dave=E2=80=99s veth testing earlier was u= sing three namespaces / veth devices, maybe for this reason(?) > > So under the category of =E2=80=9Cunsurprising=E2=80=9D, with netem as a = root qdisc in a separate namespace/veth device from cake, there is no locku= p. The attached script creates an environment with 6 namespaces (client, cl= ient qdisc, client delay, server delay, server qdisc, server) with veth dev= ices / bridges between. It=E2=80=99s easy to switch the qdisc or netem para= ms, if anyone needs such a thing. > > Only, I wonder if high BDP links can be emulated with netem. Say I want 1= 0gbit with 100ms rtt. If I use =E2=80=9Cnetem delay 50ms=E2=80=9D each dire= ction, rtt is correct, but throughput for iperf3 drops from 30Gbit to 450Mb= it. CPU is a few percent, so that=E2=80=99s not the issue. Fiddling with TC= P window (iperf3 -w) just seems to make it worse. So I=E2=80=99m still figu= ring out netem, I guess... > > Pete > _______________________________________________ > Cake mailing list > Cake@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cake --=20 Dave T=C3=A4ht CEO, TekLibre, LLC http://www.teklibre.com Tel: 1-669-226-2619