netdev - Re: [PATCH v5] net: dev_weight: TX/RX orthogonality

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Message-Id: <20161229.201647.324176080385260025.davem@davemloft.net>
Date:   Thu, 29 Dec 2016 20:16:47 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     matthias.tafelmeier@....net
Cc:     netdev@...r.kernel.org, hagen@...u.net, fw@...len.de,
        edumazet@...gle.com, daniel@...earbox.net
Subject: Re: [PATCH v5] net: dev_weight: TX/RX orthogonality

From: Matthias Tafelmeier <matthias.tafelmeier@....net>
Date: Thu, 29 Dec 2016 21:37:21 +0100

> Oftenly, introducing side effects on packet processing on the other half
> of the stack by adjusting one of TX/RX via sysctl is not desirable.
> There are cases of demand for asymmetric, orthogonal configurability.
> 
> This holds true especially for nodes where RPS for RFS usage on top is
> configured and therefore use the 'old dev_weight'. This is quite a
> common base configuration setup nowadays, even with NICs of superior processing
> support (e.g. aRFS).
> 
> A good example use case are nodes acting as noSQL data bases with a
> large number of tiny requests and rather fewer but large packets as responses.
> It's affordable to have large budget and rx dev_weights for the
> requests. But as a side effect having this large a number on TX
> processed in one run can overwhelm drivers.
> 
> This patch therefore introduces an independent configurability via sysctl to
> userland.
> 
> Signed-off-by: Matthias Tafelmeier <matthias.tafelmeier@....net>

Much better, applied, thanks.