From: Andy Furniss <adf.lists@gmail.com>
To: lartc@vger.kernel.org
Subject: Re: Unexpected result with PFIFO or PRIO queue disciplines
Date: Mon, 15 Sep 2014 09:18:29 +0000 [thread overview]
Message-ID: <5416AEE5.9030808@gmail.com> (raw)
In-Reply-To: <54116922.3080902@observatelecom.com>
Miguel Ángel Bernabé wrote:
> My gateway is connected to the internet via ATM/DSL connection,
> upstream speed is 0.6Mbps and downstream speed is 10Mbps. If i
> configure the router as a bridge between LAN/ATM ports and I try to
> connect via PPPoE from LAN (so i configure the Qdisc for ppp0
> interface) I get the same unexpected result, so the bottleneck is not
> in my router.
You need to use something like htb that rate limits and set the limit
for your wan speed.
dsl/atm have overheads so ideally you need to know exactly how you are
connecting (pppoa/pppoe/llc/vc mux/ipoa etc) to allow for these. Failing
that you will need to set speed somewhat below the sync speed.
> Are `prio` or `pfifo_fast` queue disciplines broken in the Linux
> kernel?.
Not broken, but without something rate limiting you need to be heavily
maxing the eth and even then there may be buffering in driver/somewhere
that can mess up some tests.
prev parent reply other threads:[~2014-09-15 9:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-11 9:19 Unexpected result with PFIFO or PRIO queue disciplines Miguel Ángel Bernabé
2014-09-15 9:18 ` Andy Furniss [this message]
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