netdev - Re: [PATCH v4] rfs: Receive Flow Steering

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Message-ID: <4BC89F6D.2080604@hp.com>
Date:	Fri, 16 Apr 2010 10:33:33 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Tom Herbert <therbert@...gle.com>
CC:	Stephen Hemminger <shemminger@...tta.com>, davem@...emloft.net,
	netdev@...r.kernel.org, eric.dumazet@...il.com,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v4] rfs: Receive Flow Steering

> 
> This is true.  There is a fundamental question of whether scheduler
> should lead networking or vice versa.  The advantages of networking
> following scheduler seem to become more apparent on heavily loaded
> systems or with threads that handle more than one flow.

I will confess to being in the networking should follow the scheduler camp :)

> I'm not sure these two models have to be mutually exclusive, we are
> looking at some ways to make a hybrid model.

It is perhaps too speculative on my part, but if the host has no control over 
the remote addressing of the connections to/from it, doesn't that suggest that 
allowing networking to lead the scheduler gives "external forces" more say in 
intra-system resource consumption than we might want them to have?

rick jones
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