netdev - Re: rps perfomance WAS(Re: rps: question

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Message-Id: <20100415.015756.67917222.davem@davemloft.net>
Date:	Thu, 15 Apr 2010 01:57:56 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	therbert@...gle.com, hadi@...erus.ca, shemminger@...tta.com,
	netdev@...r.kernel.org, robert@...julf.net, xiaosuo@...il.com,
	andi@...stfloor.org
Subject: Re: rps perfomance WAS(Re: rps: question

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 14 Apr 2010 22:57:41 +0200

> RPS can be tuned (Changli wants a finer tuning...), it would be
> intereting to tune multiqueue devices too. I dont know if its possible
> right now.

Only NIU allows real detailed control over queue selection and
stuff like that, because the hardware has a real TCAM for
packet matching and packets which match in TCAM entries can
steer to different collections of queues.

We have ethtool interfaces for this (ETHTOOL_GRXCLS*), so you can
change it.

For most other chips we only have interfaces for modifying the
RX hashing algorithm or what the RX hash covers, stuff like
that.

See also ETHTOOL_GRXFH, ETHTOOL_SRXFH, ETHTOOL_SRXNTUPLE, and
ETHTOOL_GRXNTUPLE, the latter two of which were added for Intel
NICs.
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