netdev - Re: [PATCH net-next 0/5] tcp: add zero copy receive

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Message-Id: <20180416.184837.997129432524220807.davem@davemloft.net>
Date:   Mon, 16 Apr 2018 18:48:37 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, ncardwell@...gle.com, ycheng@...gle.com,
        soheil@...gle.com, eric.dumazet@...il.com
Subject: Re: [PATCH net-next 0/5] tcp: add zero copy receive

From: Eric Dumazet <edumazet@...gle.com>
Date: Mon, 16 Apr 2018 10:33:34 -0700

> This patch series add mmap() support to TCP sockets for RX zero copy.
> 
> While tcp_mmap() patch itself is quite small (~100 LOC), optimal support
> for asynchronous mmap() required better SO_RCVLOWAT behavior, and a
> test program to demonstrate how mmap() on TCP sockets can be used.
> 
> Note that mmap() (and associated munmap()) calls are adding more
> pressure on per-process VM semaphore, so might not show benefit
> for processus with high number of threads.

Great work.  I can see how it is less effective without the rcvlowat
fixes/tweaks.

Series applied, thanks Eric!