linux-kernel - Re: Fast network file copy; "recvfile()" ?

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Date:	Thu, 17 Jan 2008 23:38:58 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	"Patrick J. LoPresti" <lopresti@...il.com>
cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Fast network file copy; "recvfile()" ?


On Jan 17 2008 12:53, Patrick J. LoPresti wrote:

>Using 10GigE cards and the usual tweaks to tcp_rmem etc., I am
>getting single-stream TCP throughput better than 600 MB/sec.

Hm, be aware not to hit the sequence wrap :)

>1) O_DIRECT read() + send()
>2) mmap() + madvise(WILLNEED) + send()
>3) fadvise(WILLNEED) + sendfile()
>
>I am leaning towards (3), since I gather that sendfile() is supposed
>to be pretty fast.
>
>My question is what to do on the receiving end.  In short, if I want
>the equivalent of a "recvfile()" to go with sendfile(), what is my
>best bet on Linux?

splice() I think.
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