linux-kernel - Re: [PATCH net-next] r8152: reduce memory copy for rx

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Date:	Tue, 02 Dec 2014 22:07:38 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hayes Wang <hayeswang@...ltek.com>
Cc:	netdev@...r.kernel.org, nic_swsd@...ltek.com,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH net-next] r8152: reduce memory copy for rx

On Wed, 2014-12-03 at 13:14 +0800, Hayes Wang wrote:
> If the data size is more than half of the AGG_BUG_SZ, allocate a new
> rx buffer and use skb_clone() to avoid the memory copy.
> 
> The original method is that allocate the memory and copy data for each
> packet in a rx buffer. The new one is that when the data size for a rx
> buffer is more than RX_THRESHOLD_CLONED, allocate a new rx buffer and
> use skb_clone for each packet in the rx buffer. According to the
> experiment, the new mothod has better performance.

Better performance for what workload exactly ?

cloning in rx path has many drawbacks, with skb->truesize being usually
wrong.



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