netdev - Re: [PATCH net] net/mlx5e: Do not recycle pages from emergency reserve

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Message-Id: <20170123.104540.2005179027278796046.davem@davemloft.net>
Date:   Mon, 23 Jan 2017 10:45:40 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     brouer@...hat.com
Cc:     saeedm@....mellanox.co.il, tom@...bertland.com,
        saeedm@...lanox.com, netdev@...r.kernel.org, tariqt@...lanox.com,
        eric.dumazet@...il.com
Subject: Re: [PATCH net] net/mlx5e: Do not recycle pages from emergency
 reserve

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Mon, 23 Jan 2017 09:39:40 +0100

> BUT there are other advantages of using a guaranteed recycle pool
> facility (like the page_pool).  Namely, (1) DMA-overhead: keeping page
> DMA mapped to counter DMA+IOMMU overhead, (2) RX-zero-copy: opens up
> for a software memory model solution for pre-VMA-mapping pages to
> userspace (See: [1] for argument how this avoids leaking kernel mem,
> but only expose/leak packet-data mem)

+1