netdev - Re: [PATCH v2] xps-mp: Transmit Packet Steering for multiqueue

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Date:	Wed, 13 Oct 2010 08:41:16 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH v2] xps-mp: Transmit Packet Steering for multiqueue

On Tue, Oct 12, 2010 at 10:48 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> Le mardi 12 octobre 2010 à 17:20 -0700, Tom Herbert a écrit :
> > +#ifdef CONFIG_RPS
> > +       struct kobject          kobj;
> > +       struct netdev_queue     *first;
> > +       atomic_t                count;
> > +       struct xps_map          *xps_maps;
> > +#endif
>
> Please put kobj at the end of this block, because its a big object (64
> bytes)
>
Okay.

> +#ifdef CONFIG_RPS
> > +       struct xps_map          *xps_maps;
> > +       struct netdev_queue     *first;
> > +       atomic_t                count;
> > +       struct kobject          kobj;
> > +#endif
> >
>
> This way, we only use one cache line to access hot path fields, instead
> of two cache lines.
>
Okay.

>
>
> Tom, I believe you should split your patch in several parts, its really
> too hard to review.
>
>
> For example the netif_alloc_netdev_queues() stuff should be a patch on
> its own, as this stuff was already discussed on netdev some days ago, so
> that you could copy Ben and me on this one ;)
>
Ahh, that was some discussion about TX queues in the thread about RX
queue allocation.  I seemed to have missed that part.

> (Ie not allocating _tx in alloc_netdev_mq() but in register_netdevice())
>
Sorry about that.  The good changes in rx queue motivated these
changes.  I'll extract the parts that move the TX queue allocation
into a separate patch.

Thanks for reviewing,
Tom

>
>
> Its also a good thing to give diffstat output :
>
>  include/linux/netdevice.h |   28 +++
>  include/linux/skbuff.h    |    1
>  net/core/dev.c            |  191 ++++++++++++++++------
>  net/core/net-sysfs.c      |  305 +++++++++++++++++++++++++++++++++++-
>  net/core/net-sysfs.h      |    3
>  net/ipv4/tcp_output.c     |    4
>  6 files changed, 471 insertions(+), 61 deletions(-)
>
>
>
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