RE: [PATCH net-next] r8152: reduce memory copy for rx
From: Hayes Wang
Date: Wed Dec 03 2014 - 04:09:28 EST
Eric Dumazet [mailto:eric.dumazet@xxxxxxxxx]
> 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.
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