netdev - Re: [PATCH net-next] tcp: drop dst in tcp_add

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Date:   Tue, 20 Nov 2018 10:26:10 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next] tcp: drop dst in tcp_add_backlog()

From: Eric Dumazet <edumazet@...gle.com>
Date: Tue, 20 Nov 2018 10:21:22 -0800

> On Tue, Nov 20, 2018 at 10:16 AM David Miller <davem@...emloft.net> wrote:
>>
>> Well, I'm sure we "handle" it.  But I was more asking about the performance
>> tradeoff, which probably is on the side of your change but I wanted to
>> just be sure.
> 
> Ah sorry for misunderstanding.
> Yes, that should be fine, backlog is not generally used at the
> beginning of a flow.
> 
> I am working on adding coalescing support to tcp_add_backlog() to balance
> time spent in softirq and time spent from process context, hoping to reduce
> probability of having user threads trapped for a while in __release_sock()

Ok, meanwhile I applied the patch under discussion.

Thanks.