netdev - RE: [PATCH net-next] r8152: reduce memory copy for rx

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Message-ID: <0835B3720019904CB8F7AA43166CEEB2ED364C@RTITMBSV03.realtek.com.tw>
Date:	Wed, 3 Dec 2014 09:09:12 +0000
From:	Hayes Wang <hayeswang@...ltek.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	nic_swsd <nic_swsd@...ltek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH net-next] r8152: reduce memory copy for rx

Eric Dumazet [mailto:eric.dumazet@...il.com] 
> Sent: Wednesday, December 03, 2014 3:15 PM
[...]
> Have you tried using more concurrent RX flows, in a possibly lossy
> environment (so that TCP is forced to queue packets in out of order
> queue) ?

I don't do the test. I would check it next time.

> skb cloning prevents GRO and TCP coalescing from working.
> 
> netfilter might also be forced to copy whole frame in case a mangle is
> needed (eg with NAT ...)
> 
> I would rather try to implement GRO, and/or using fragments instead of
> pure linear skbs.
> 
> (skb->head would be around 128 or 256 bytes, and you attach to skb the
> frame as a page fragment)

Thanks for your response. I would study the GRO first.
 
Best Regards,
Hayes
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