From: Jonathan Morton <chromatix99@gmail.com>
To: grenville armitage <garmitage@swin.edu.au>
Cc: bloat@lists.bufferbloat.net
Subject: Re: [Bloat] Progress with latency-under-load tool
Date: Sat, 19 Mar 2011 19:44:09 +0200 [thread overview]
Message-ID: <D6CB32E1-14D1-4EC1-946F-5738A754082B@gmail.com> (raw)
In-Reply-To: <4D829B58.1070601@swin.edu.au>
On 18 Mar, 2011, at 1:38 am, grenville armitage wrote:
> So, this is probably tangential to what the latency-under-load tool is
> aiming to achieve, but we have a tool that can be used to measure
> RTT between two points (e.g. either side of an 802.11 link) using
> tcpdump on consumer-grade PCs and no active probing (ala ping).
The average actual consumer isn't going to be able to set that up. Sounds great for research though.
After much headbutting of walls, my tool finally seems to work. The biggest challenge turned out to be getting both ends to shut down gracefully (and more-or-less simultaneously) after each phase of the test.
With that solved, I'm now running a full test run between two of my less powerful machines on a wired LAN. I can immediately see that even a 1996-vintage PC can saturate a 100Mbps link hard enough to exhibit bloat-related problems. Once again, anyone claiming this to be a "new problem" is grossly misinformed.
More details when I have them.
- Jonathan
next prev parent reply other threads:[~2011-03-19 17:44 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-16 2:31 Jonathan Morton
2011-03-16 17:12 ` Rick Jones
2011-03-17 23:38 ` grenville armitage
2011-03-19 17:44 ` Jonathan Morton [this message]
2011-03-20 10:45 ` Jonathan Morton
2011-03-20 20:33 ` grenville armitage
2011-03-20 20:53 ` Dave Täht
2011-03-20 21:52 ` Jonathan Morton
2011-03-20 22:32 ` Dave Täht
2011-03-20 22:47 ` Dave Täht
2011-03-20 22:52 ` Jonathan Morton
2011-03-20 22:55 ` Dave Täht
2011-03-20 23:42 ` Dave Täht
2011-03-20 21:50 ` [Bloat] Some results of the latency under load tool Dave Täht
2011-03-20 22:24 ` Jonathan Morton
[not found] ` <m3d3llgln8.fsf@yahoo.com>
2011-03-21 6:43 ` [Bloat] Progress with latency-under-load tool Jonathan Morton
2011-03-22 1:13 ` Kim Hawtin
2011-03-22 7:10 ` Jonathan Morton
2011-03-23 10:33 ` Otto Solares Cabrera
2011-03-23 11:26 ` Jonathan Morton
2011-03-23 19:27 ` Otto Solares
2011-03-23 20:40 ` Jonathan Morton
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