netdev - Re: [PATCH] xps-mq: Transmit Packet Steering for multiqueue

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Message-ID: <20100901184802.5a79cf9f@nehalam>
Date:	Wed, 1 Sep 2010 18:48:02 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	therbert@...gle.com, eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] xps-mq: Transmit Packet Steering for multiqueue

On Wed, 01 Sep 2010 18:32:51 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Tom Herbert <therbert@...gle.com>
> Date: Wed, 1 Sep 2010 09:24:18 -0700
> 
> > On Wed, Sep 1, 2010 at 8:54 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >> 3) Eventually have a user selectable selection (socket option, or system
> >> wide, but one sysctl, not many bitmasks ;) ).
> >>
> > Right, but it would also be nice if a single sysctl could optimally
> > set up multiqueue, RSS, RPS, and all my interrupt affinities for me
> > ;-)
> 
> It's becomming increasingly obvious to me that we need (somewhere,
> not necessarily the kernel) a complete datastructure representing
> the NUMA, cache, cpu, device hierarchy.
> 
> And that can be used to tweak all of this stuff.
> 
> The policy should probably be in userspace, we just need to provide
> the knobs in the kernel to tweak it however userspace wants.
> 
> Userspace should be able to, for example, move a TX queue into a
> NUMA domain and have this invoke several side effects:
> 
> 1) IRQs for that TX queue get rerouted to a cpu in the NUMA
>    domain.
> 
> 2) TX queue datastructures in the driver get reallocated using
>    memory in that NUMA domain.
> 
> 3) TX hashing is configured to use the set of cpus in the NUMA
>    domain.
> 
> It's alot of tedious work and involves some delicate tasks figuring
> out where each of these things go, but really then we'd solve all
> of this crap one and for all.

Plus it needs to work with scheduler (not fight it).  All this doesn't
work very well if process keeps bouncing away from its resources.

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