netdev - Re: [PATCH 2/2 v5] xps: Transmit Packet Steering

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Date:	Sun, 7 Nov 2010 15:11:51 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2 v5] xps: Transmit Packet Steering

> Tom, I still dont understand why *xps_maps is here, and not in
> net_device ?
>

Originally it was in the net_device, but that necessitated a reference
be held on the device since we can't destroy the map until all
kobjects were released, but the open reference prevents the kojects
from being released in the first place.

> I am asking because netdev_get_xps_maps(dev) might be slowed down
> because queue 0 state might change often (__QUEUE_STATE_XOFF)
>
Could a add a pointer in the net_device also.

> This means _tx[0] becomes a very hot cache line, needed to access all
> queues (from get_xps_queue())
>
> Other than that, your patch seems fine (not tested yet)
>
> Thanks
>
>
>
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