From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.17.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 8F5283B29D for ; Thu, 28 Sep 2023 09:08:25 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.de; s=s31663417; t=1695906501; x=1696511301; i=moeller0@gmx.de; bh=g8GdAGHVMmE6cN7drWzyL9bZUW1wUK0xGyz+v3zZKqY=; h=X-UI-Sender-Class:Subject:From:In-Reply-To:Date:Cc:References:To; b=myESZuELslP5yaBGYL7brUiiR/BEAHOtVbypKzfitoRaJ8Wr2LmHC3l5E8Nw3AvU92oVAX3S4Vg 69ufLgIzecny+cnwfK780EeJCEgjkWEzdijqRxuu4fYBWy8yUCx7XlBOVUjex943+S+KvO/K3uyx2 TtNd7lugTUWfvHpwRU6XaUMEtsrnsw1bytk9PHMbv+8jT3PsMeCNHq1fb+sZtBDWhJ+V9NaS6dRHP KeB7exHyBCTVFAE+nZmHywLRkg17cHIQ5Tf1lUAjSMM67d7XwKVLj9zL3m/TiZkgRYAYjDbTgY3+y iDhUkuf9cFQSaz5Iko6vAbcSsM4wk6b6GUCw== X-UI-Sender-Class: 724b4f7f-cbec-4199-ad4e-598c01a50d3a Received: from smtpclient.apple ([134.76.241.253]) by mail.gmx.net (mrgmx105 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MeCpb-1rKMYV3ULH-00bHkh; Thu, 28 Sep 2023 15:08:20 +0200 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.120.41.1.4\)) From: Sebastian Moeller X-Priority: 3 (Normal) In-Reply-To: <79EC8CB2-0912-4D66-9FA3-990E9C38C281@gmail.com> Date: Thu, 28 Sep 2023 15:08:20 +0200 Cc: "David P. Reed" , Cake List Content-Transfer-Encoding: quoted-printable Message-Id: References: <1695068690.78066946@apps.rackspace.com> <6D098714-69DC-41D9-A7DC-E94FD9C77625@gmail.com> <79EC8CB2-0912-4D66-9FA3-990E9C38C281@gmail.com> To: Jonathan Morton X-Mailer: Apple Mail (2.3696.120.41.1.4) X-Provags-ID: V03:K1:GBU+U3aUegTnawnnz6m3U61LKv0gtotLAB5shK65cOzXD/q4TIb ANnGyD+M80rcdmCZmgKjema9dLccQzz+jKzRndIQpeccfOhu1h4FCdU4zeEpPlsl7yhE1hN OW+OXf70MHfUp+P3aqKzWdupMSpMDwuOnfQKFHUx1X7lQ17hV6hjM/g7GN2F0+4zTIotmpX 8jC+3/XuLzNpc1EP6+3XQ== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:fw4GRwip4Kk=;IFDS62aETR2qAW9Bbp1r3orOT2g EKdYwnQ9H5G1M1sHyNfU9/GutI71/4260ErQSIO/72gSXHce2/rjya3fKTX3XP5u5HTE29WDq nEZ0S1gc9M5PXjLcepGKzsB2blxk3x2H4gtTTya0fAbylHmPm9HJPg2jkuQvXPpYTGroDMOGQ Q6i05K1Y2h2XZAPf5sigfPqi7HFEvkkbdgJxUV9u8/8az8MePIvTJoQO5kEHSWkIeU1ynWgFU 2hoywCkyNCdCrzknd3J9Fhn8JoLRszkbCY8u80G9lEN3zbv/L+XkOS1Ua5SMU3YLi15DZWm4Y H/FNAcOPzC/HUZtY950gBP+CL5erQdOnjEq6vnA7N8kKmk/AFDnP0LaXxy8H23O+XtUl7mQFs EUUood8FvKcN0M2LxgOz+yAIjnXrosO1Lzv1/gbdizi+DCCrCuAOfIeQ/JkPXo26841pfEQaO 3Mowx7okkzeKixc2+41APthovDDM4k7Uv82d0Te0sy3hgLbqHhXOX7vZsY6FqD7KDKASUPqJk ypiEiDbN6sAbM7JZErbOdmO7AABWm5EMozWXV2xmP55zAFAvqJRg9pk8tY6U0ygwyL9tfdfqK 9uLnig0AvsQAlH3UcXzp5AQxFeglbb2o48M/0BmNiS3UT0VHFMWYoQdmn4FQUXLT9D2ZTMRSp 4SVrRtU5cdRoWo8FB+82a7EdSXiSXQYMTFATklkvGL6njTm/SXlmbhB740Lsn8XhioXdS+MAy rDLMy2TYW6im1x8nG//JvkiwRGk7HU6XaWCoFJcBSOHG+lowtxbNiJfBL28I79KN+87a+D56y O8/oI+iIocj8/qHFHUPRngb43743yEKGVNi5dU7MRPXVcd7O2JfXL9ygJpenlY/kVhsaH/Uks fRkKNYgZHeiL6GyYOZA/5d5osGXGknxgze0LRwgyJJ153XM5m3+/vAMDGctYTx9mVApgTtCNm ssQjrngbubUDeS47OOA2UCUcO1Q= Subject: Re: [Cake] some comprehensive arm64 w/cake results 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: Thu, 28 Sep 2023 13:08:25 -0000 Hi Jonathan, > On Sep 28, 2023, at 14:33, Jonathan Morton = wrote: >=20 >> On 28 Sep, 2023, at 3:15 pm, Sebastian Moeller = wrote: >>=20 >> This promises even better performance for loads like cake than the = already pretty nifty pi4B >=20 > Well, increased computing performance is always welcome - but as I've = said before, in most cases I don't think CPU performance is the limiting = factor for CAKE. >=20 > When the CPU load goes up as networking throughput reaches the = physical limit of the interface (or the I/O subsystem), what you're = seeing is the CPU just spinning its wheels while waiting for a mutex to = unblock. Spinning faster doesn't make the mutex unblock sooner! [SM] I think that the improvements of cache and memory hierarchy = and throughput will be helpful, currently some people report odd issues = with rpi4Bs depending on how many and which cores are used, I hope that = the rpi5 ameliorates these issues. The gigabit ethernet adapter was = already connected well to the SoC starting with the rpi4 when they = ditched the USB2 bus used by earlier pis to connect the ethernet. But I = agree it will require real benchmarks to see if the newer design truly = delivers more cake performance and if yes, how much more. (And I also = note that the rpi4B is not doing badly at 1 Gbps ethernet either, at = least for "normal" numbers of parallel flows. Regarding a full dual (or triple) interface router, I have hopes = that a PCIe connected NIC might be generally better than a USB3 dongle = (even though USB3 on paper has plenty capacity for gigabit ethernet). Regards Sebastian P.S.: I am tempted, but will likely wait until they are available in = quantity and hope that the street price comes down a bit before getting = one ;) >=20 > - Jonathan Morton