From: David Lang <david@lang.hm>
To: Dave Taht <dave.taht@gmail.com>
Cc: cake@lists.bufferbloat.net
Subject: Re: [Cake] faster scheduling, maybe
Date: Mon, 6 Jun 2016 11:48:52 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.02.1606061133310.12900@nftneq.ynat.uz> (raw)
In-Reply-To: <CAA93jw5Cc9A7VOdrW1KKKRcJM2ms+T-RqL9wjGesZL1mysAaTA@mail.gmail.com>
On Mon, 6 Jun 2016, Dave Taht wrote:
> http://info.iet.unipi.it/~luigi/papers/20160511-mysched-preprint.pdf
I don't think so.
They don't even try for fairness between flows, they are just looking at
fairness between different VMs. they tell a VM that it has complete access to
the NIC for a time, then give another VM complete access to the NIC. At best
they put each VMs traffic into a different hardware queue in the NIC.
This avoids all AQM decisions on the part of the host OS, because the packets
never get to the host OS.
The speed improvement is by bypassing the host OS and just having the VMs
deliver packets directly to the NIC. This speeds things up, but at the cost of
any coordination across VMs. Each VM can run fq_codel but it's much corser
timeslicing between VMs.
David Lang
next prev parent reply other threads:[~2016-06-06 18:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-06 18:24 Dave Taht
2016-06-06 18:48 ` David Lang [this message]
2016-06-06 18:55 ` Dave Taht
2016-06-06 19:25 ` David Lang
2016-06-06 22:34 ` Benjamin Cronce
2016-06-06 22:51 ` David Lang
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