From: Dave Taht <dave.taht@gmail.com>
To: Jonathan Morton <chromatix99@gmail.com>
Cc: bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] Applying RED93 in south africa
Date: Sat, 21 May 2011 13:29:23 -0600 [thread overview]
Message-ID: <BANLkTikcu5tm+jU9pYjegaOwVYE3RLMp6A@mail.gmail.com> (raw)
In-Reply-To: <694BB12A-0720-4CDB-B245-41A7C4E90363@gmail.com>
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On Sat, May 21, 2011 at 1:11 PM, Jonathan Morton <chromatix99@gmail.com>wrote:
>
> On 21 May, 2011, at 5:27 pm, Dave Taht wrote:
>
> > Experience the pain of the Internet on another continent! (note that the
> gw is up on ipv6 as well)
>
> Well, it's not very fast in terms of throughput, but the latency seems to
> be about as good as I get normally.
It's simulating conditions in South Africa, with settings to 840 down/380
up.
> But perhaps that's because I'm starting from Northern Europe and so I'm
> already used to intercontinental traffic due to the prevalence of US-based
> servers.
>
> I do see occasional brief stalls during the download, but these are
> substantially less intrusive than what I get on my 3G modem. They suggest
> that packets are being dropped at reasonably regular intervals, but the TCP
> is recovering quickly. I can't tell whether RED is triggering (without ECN)
> or whether these are tail-drops on a fairly short queue.
>
> Incidentally my download is coming across IPv6, so it may be triggering the
> related Linux bug.
Which one? on my side all known bugs are fixed. :)
> This shouldn't totally disable the negotiation though, so more likely
> there's a broken router in the way.
>
>
And it is highly likely you are interacting with slightly different layer of
QoS if you are using IPv6.
Could you take a tcpdump capture and stick it somewhere? Or let me know
when you will be running a test and I'll capture traces from here? I did see
the wan light flicker madly a few minutes ago....
How be your latency under load too?
- Jonathan
>
>
--
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
http://the-edge.blogspot.com
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next prev parent reply other threads:[~2011-05-21 19:17 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-21 14:27 Dave Taht
2011-05-21 19:11 ` Jonathan Morton
2011-05-21 19:29 ` Dave Taht [this message]
2011-05-28 20:02 ` Juliusz Chroboczek
2011-05-31 15:02 ` Jim Gettys
2011-05-28 20:07 ` Juliusz Chroboczek
2011-05-28 20:16 ` Dave Taht
2011-05-28 20:30 ` Juliusz Chroboczek
2011-05-28 20:59 ` [Bloat] SFB tuning (was Re: Applying RED93 in south africa) Otto Solares Cabrera
2011-05-29 15:29 ` [Bloat] SFB tuning Juliusz Chroboczek
2011-05-30 0:52 ` Otto Solares Cabrera
2011-05-30 22:05 ` Juliusz Chroboczek
2011-05-30 23:37 ` Otto Solares Cabrera
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