linux-kernel - Re: [PATCH net-next V2 1/3] tap: use build

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Message-Id: <20170816.093054.959220457289425520.davem@davemloft.net>
Date:   Wed, 16 Aug 2017 09:30:54 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     mst@...hat.com, eric.dumazet@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kubakici@...pl
Subject: Re: [PATCH net-next V2 1/3] tap: use build_skb() for small packet

From: Jason Wang <jasowang@...hat.com>
Date: Wed, 16 Aug 2017 17:17:45 +0800

> It looks like full page allocation just produce too much stress on the
> page allocator.
> 
> I get 1.58Mpps (full page) vs 1.95Mpps (page frag) with the patches
> attached.

Yes, this is why drivers doing XDP tend to drift towards implementing
a local cache of pages.