From: Pete Heist <peteheist@gmail.com>
To: Jonathan Morton <chromatix99@gmail.com>
Cc: Cake List <cake@lists.bufferbloat.net>
Subject: Re: [Cake] Cake latency update
Date: Tue, 14 Feb 2017 11:02:11 +0100 [thread overview]
Message-ID: <7DB7E26B-2BFE-4741-B0B0-F069CC33F75B@gmail.com> (raw)
In-Reply-To: <D38F51AC-EB5D-4B6A-8C05-F4C6DF680A4C@gmail.com>
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> On Feb 12, 2017, at 6:15 PM, Pete Heist <peteheist@gmail.com> wrote:
>
>> On Feb 12, 2017, at 5:41 PM, Jonathan Morton <chromatix99@gmail.com> wrote:
>>
>>> On 12 Feb, 2017, at 16:12, Pete Heist <peteheist@gmail.com> wrote:
>>>
>>> 2) Using a 1.25 GHz Mac Mini PPC G4 I have laying around. I successfully ran fq_codel for ADSL on that box in the past, but at 5 / 0.5 Mbps. Accurate Flent results running Cake at 80 Mbps? Timer issues?
>>
>> That should be absolutely fine at 80Mbps. PowerPC Macs seem to have good hi-res timers in my experience, and the Sun GEM is a relatively good NIC. The main limitation is that it’s PCI rather than PCIe, so it can’t reach the full GigE line rate, but it does go well above 100Mbps.
>>
>> Don’t worry about BQL, since you’re not relying on NIC backpressure to control queuing.
>
> Ok, good news, then that’s the way I’ll go! Thanks for that, more results later...
Replacing the MBP (sky2 Ethernet driver) with a PPC G4 with the Sun GEM appears to have fixed the class of five-second-throughput-shifts that I reported earlier. See the much smoother Cake results below. :) I’ll be re-running all of my other tests again.
It does raise a new question though. In the 10 Mbit and 20 Mbit Cake tests, one of the TCP download flows gets a bit starved relative to the average. I was seeing this earlier also before I moved to the PPC. I don’t see this at 30Mbit and above. There is also a latency variation in 75Mbit fq_codel, so I know that sometimes you can just say “it’s Wi-Fi”. I don’t have the time to check this on Ethernet now, but maybe later.
Cake:
http://www.drhleny.cz/bufferbloat/cake_hd-eth_10mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_10mbit/index.html> (partial starvation for one tcp download flow)
http://www.drhleny.cz/bufferbloat/cake_hd-eth_20mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_20mbit/index.html> (partial starvation for one tcp download flow)
http://www.drhleny.cz/bufferbloat/cake_hd-eth_30mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_30mbit/index.html>
http://www.drhleny.cz/bufferbloat/cake_hd-eth_40mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_40mbit/index.html>
http://www.drhleny.cz/bufferbloat/cake_hd-eth_50mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_50mbit/index.html>
http://www.drhleny.cz/bufferbloat/cake_hd-eth_60mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_60mbit/index.html>
http://www.drhleny.cz/bufferbloat/cake_hd-eth_70mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_70mbit/index.html>
http://www.drhleny.cz/bufferbloat/cake_hd-eth_75mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_75mbit/index.html>
http://www.drhleny.cz/bufferbloat/cake_hd-eth_80mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_80mbit/index.html>
http://www.drhleny.cz/bufferbloat/cake_hd-eth_85mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_85mbit/index.html>
http://www.drhleny.cz/bufferbloat/cake_hd-eth_90mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_90mbit/index.html>
http://www.drhleny.cz/bufferbloat/cake_hd-eth_100mbit/index.html <http://www.drhleny.cz/bufferbloat/cake_hd-eth_100mbit/index.html>
fq_codel:
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_10mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_10mbit/index.html>
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_20mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_20mbit/index.html>
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_30mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_30mbit/index.html>
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_40mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_40mbit/index.html>
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_50mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_50mbit/index.html>
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_60mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_60mbit/index.html>
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_70mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_70mbit/index.html>
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_75mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_75mbit/index.html> (latency variation and something wrong in one udp flow)
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_80mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_80mbit/index.html>
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_85mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_85mbit/index.html>
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_90mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_90mbit/index.html>
http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_100mbit/index.html <http://www.drhleny.cz/bufferbloat/fq_codel_hd-eth_100mbit/index.html>
Pete
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prev parent reply other threads:[~2017-02-14 10:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-09 16:36 Pete Heist
2017-02-09 20:52 ` Jonathan Morton
2017-02-10 8:04 ` Pete Heist
2017-02-10 8:49 ` Jonathan Morton
2017-02-10 9:21 ` Pete Heist
2017-02-10 9:29 ` Jonathan Morton
2017-02-10 10:05 ` Pete Heist
2017-02-10 10:31 ` Jonathan Morton
2017-02-10 11:08 ` Pete Heist
2017-02-10 11:35 ` Sebastian Moeller
2017-02-10 12:21 ` Pete Heist
2017-02-12 12:43 ` Pete Heist
2017-02-12 13:08 ` Dave Taht
2017-02-12 14:12 ` Pete Heist
2017-02-12 16:37 ` Pete Heist
2017-02-12 16:41 ` Jonathan Morton
2017-02-12 17:15 ` Pete Heist
2017-02-14 10:02 ` Pete Heist [this message]
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