netdev - Re: Splice on blocking TCP sockets again..

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Message-ID: <4AC2F1D9.1010801@gmail.com>
Date:	Wed, 30 Sep 2009 07:51:21 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Volker Lendecke <vl@...ba.org>
Subject: Re: Splice on blocking TCP sockets again..

Jason Gunthorpe a écrit :
>> One way to handle this is to switch tcp_read() to use the underlying file O_NONBLOCK
>> flag, as other socket operations do. And let SPLICE_F_NONBLOCK control the pipe output only.

arg, this was tcp_splice_read() of course

> 
> Thanks Eric, this seems reasonable from my userspace perspective.
> 
> I admit I don't understand why SPLICE_F_NONBLOCK exists, it seems very
> un-unixy to have a syscall completely ignore the NONBLOCK flag of the
> fd it is called on. Ie setting NONBLOCK on the pipe itself does
> nothing when using splice..
> 

Hmm, good question, I dont have the answer but I'll digg one.
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