netdev - Re: [PATCH RFC net-next 2/7] net: add dst_pending

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Message-ID: <11f3e6c9-5eec-8275-3323-0c1de91f8c23@huawei.com>
Date:   Fri, 20 Jan 2017 11:39:25 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     Julian Anastasov <ja@....bg>
CC:     Eric Dumazet <eric.dumazet@...il.com>, <netdev@...r.kernel.org>,
        <linux-sctp@...r.kernel.org>
Subject: Re: [PATCH RFC net-next 2/7] net: add dst_pending_confirm flag to
 skbuff


On 2016/12/20 4:37, Julian Anastasov wrote:
> 
> 	Hello,
> 
> On Mon, 19 Dec 2016, Eric Dumazet wrote:
> 
>> I am still digesting this awesome patch series ;)
> 
> 	Thanks. I don't feel quite comfortable with some
> of the changes (mostly XFRM, dst_confirm usage in CXGB) and
> I hope the discussion can provide adequate solution.
> 
>> Not sure why you used an unlikely() here. TCP for example would hit this
>> path quite often.
> 
> 	I was not sure, may be because ACKs can come with lower
> rate than the sent packets. Also because non-TCP rarely uses
> MSG_CONFIRM. If you still think it is better without unlikely,
> I'll remove it.
> 
>> So considering sk_dst_pending_confirm might be dirtied quite often,further 
>>
>> I am not sure why you placed it in the cache line that contains
>> sk_rx_dst (in 1st patch)
> 
> 	I saw your recent changes and was worried if the
> sk_dst_confirm() calling on RX can cause unwanted dirtying of
> additional cache line. My preliminary analyze pointed
> sk_omem_alloc as good candidate for moving to next cache
> line. I know how critical is to properly place the new flags,
> so I really need recommendations about this.
> 
> Regards
> 
> --
> Julian Anastasov <ja@....bg>
> 
> .
> 

Sorry for so late reply.
I have test your new patch, It works well in my scene.

Everybody,Is there any further comment about this awesome patch series?