From: grenville armitage <garmitage@swin.edu.au>
To: bloat <bloat@lists.bufferbloat.net>
Subject: [Bloat] Ethernet PAUSE frames, concatenated buffers
Date: Mon, 11 Feb 2013 13:42:02 +1100 [thread overview]
Message-ID: <51185A7A.2000708@swin.edu.au> (raw)
So, Dave Taht suggested this might be of interest to some on
this list -- keep an eye out for consumer devices helpfully
using Ethernet PAUSE frames for layer 2 flow control.
We recently stumbled across this when exploring the behaviour of
a certain Netgear HomePlugAV (Ethernet over home powerline) device.
It was fun enough that the devices had a few thousand packets of
internal buffering. But when their buffer came close to full they'd
push-back with Ethernet PAUSE frames, forcing the next NIC upstream
(e.g. a host OS stack) to begin OS-specific buffering of outbound
Ethernet frames for a short while. This essentially concatenated the
HomePlugAV device's buffering with the sending host's NIC driver
buffering. Bufferbloat++
More details of our specific experiments can be found here,
http://caia.swin.edu.au/reports/130121A/CAIA-TR-130121A.pdf
cheers,
gja
next reply other threads:[~2013-02-11 2:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-11 2:42 grenville armitage [this message]
2013-02-11 8:16 Jeroen Balduyck
2013-02-11 8:19 ` Jeroen Balduyck
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