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From: Michael Richardson <mcr@sandelman.ca>
To: davecb@spamcop.net
Cc: bloat@lists.bufferbloat.net
Subject: Re: [Bloat] wifi AP switching time
Date: Sun, 06 Jan 2013 20:34:31 -0500	[thread overview]
Message-ID: <17132.1357522471@sandelman.ca> (raw)
In-Reply-To: <50E6F076.4070403@rogers.com>


I asked
    > A comment was made a month ago or so about how long it takes wifi APs
    > to switch from transmitting (unicast) to one station to another.  That
    > there was quite a large latency here, and that this was one reason that
    > the AP designers wanted large buffers to accmulate, so that the
    > switching time could be amortized over a larger number of packets.

Pedro Tumusok <pedro.tumusok@gmail.com> replied
    > I might be way of here, but to me this sounds like a-mpdu which is
    > used to aggregate frames to get higher throughput. Thats in the
    > specification, its 
    > in 802.11ac and I believe that it go introduced with 802.11n.
    > 
    > It is there to mitigate the overhead of aquiring the channel.

Does this mean that 802.11a,b do not suffer from this problem?

-- 
]               Never tell me the odds!                 | ipv6 mesh networks [ 
]   Michael Richardson, Sandelman Software Works        | network architect  [ 
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails    [ 
	

  reply	other threads:[~2013-01-07  1:35 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <mailman.5.1357243201.32365.bloat@lists.bufferbloat.net>
2013-01-04 15:08 ` David Collier-Brown
2013-01-07  1:34   ` Michael Richardson [this message]
2013-01-07  3:43     ` Pedro Tumusok
2013-01-01 17:49 Michael Richardson
2013-01-03  9:18 ` Pedro Tumusok

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