linux-kernel - Re: [PATCH v2] net: bcmgenet: fix throughtput regression

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Message-Id: <20150227.171043.1173553752636358034.davem@davemloft.net>
Date:	Fri, 27 Feb 2015 17:10:43 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	f.fainelli@...il.com
Cc:	jaedon.shin@...il.com, linux-kernel@...r.kernel.org,
	eric.dumazet@...il.com, pgynther@...gle.com, pgynther@...gle.com
Subject: Re: [PATCH v2] net: bcmgenet: fix throughtput regression

From: Florian Fainelli <f.fainelli@...il.com>
Date: Fri, 27 Feb 2015 09:38:12 -0800

> On 27/02/15 06:27, Jaedon Shin wrote:
>> This patch adds bcmgenet_tx_poll for all active tx_rings. It can reduce
>> the interrupt load and send xmit in upper network stack on time.
>> 
>> The bcmgenet_tx_reclaim of tx_ring[{0,1,2,3}] process only under 18
>> descriptors is to late reclaiming transmitted skb. Therefore,
>> performance degradation of xmit after 605ad7f ("tcp: refine TSO
>> autosizing").
> 
> This looks very similar to my previous attempts at using NAPI for TX
> completion, thanks for doing this.
> 
> One thing you are not mentioning in your commit message is that ring16
> used to be reclaimed/cleaned as part of the shared RX/TX NAPI context
> (bcmgenet_poll), while you are now dedicating one and using
> bcmgenet_tx_poll() for reclaim. This is a big enough change in the
> driver structure that deserves to be reflected in the commit message.
> 
>> 
>> Signed-off-by: Jaedon Shin <jaedon.shin@...il.com>
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Besides needing an updated commit message, this overlaps with a
cleanup patch in my queue from Petri Gynther that touches the same
exact code.

	http://patchwork.ozlabs.org/patch/443604/

How would you guys like me to sort this all out?  Drop Petri's
change for now?
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