netdev - Re: [RFC PATCH net-next] tcp: add NV congestion control

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Message-Id: <20150703.094704.283183007204034386.davem@davemloft.net>
Date:	Fri, 03 Jul 2015 09:47:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	brakmo@...com
Cc:	netdev@...r.kernel.org, kernel-team@...com
Subject: Re: [RFC PATCH net-next] tcp: add NV congestion control

From: Lawrence Brakmo <brakmo@...com>
Date: Thu, 2 Jul 2015 18:21:24 -0700

> This is a request for comments.
> 
> TCP-NV (New Vegas) is a major update to TCP-Vegas. An earlier version of
> NV was presented at 2010's LPC (slides). It is a delayed based
> congestion avoidance for the data center. This version has been tested
> within a 10G rack where the HW RTTs are 20-50us.
> 
> A description of TCP-NV, including implementation and experimental
> results, can be found at:
> http://www.brakmo.org/networking/tcp-nv/TCPNV.html
> 
> The current version includes many module parameters to support
> experimentation with the parameters.
> 
> Signed-off-by: Lawrence Brakmo <lawrence@...kmo.org>

I'm disappointed in the skb->cb[] size increase, like Eric.  This
severely negatively impacts everyone on every Linux system in the
world, not just people using NV.

The performance implications from increasing sk_buff by even 1 byte in
size are absolutely non-trivial.
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