netdev - Re: [PATCH net-next RFC WIP] Patch for XDP support for virtio

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Message-Id: <20161027.174218.654961317277160121.davem@davemloft.net>
Date:   Thu, 27 Oct 2016 17:42:18 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     mst@...hat.com
Cc:     john.fastabend@...il.com, brouer@...hat.com, shrijeet@...il.com,
        tom@...bertland.com, netdev@...r.kernel.org,
        shm@...ulusnetworks.com, roopa@...ulusnetworks.com,
        nikolay@...ulusnetworks.com
Subject: Re: [PATCH net-next RFC WIP] Patch for XDP support for virtio_net

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Fri, 28 Oct 2016 00:30:35 +0300

> Something I'd like to understand is how does XDP address the
> problem that 100Byte packets are consuming 4K of memory now.

Via page pools.  We're going to make a generic one, but right now
each and every driver implements a quick list of pages to allocate
from (and thus avoid the DMA man/unmap overhead, etc.)