netdev - Re: zero copy for relay server

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 29 Mar 2011 19:28:51 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Viral Mehta <Viral.Mehta@...infotech.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: zero copy for relay server

On Tue, Mar 29, 2011 at 12:23 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le mardi 29 mars 2011 à 10:00 +0800, Changli Gao a écrit :
>> On Tue, Mar 29, 2011 at 2:34 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
>> I think he concerns the overhead of system calls. In order to omit a
>> system call, I think you can implement sth. like this:
>>
>> splice2(infd, outfd, pipefd, ...)
>>
>
> Yes, but given no numbers are given, and no code yet written, I ask the
> question.
>
> Giving 4 file descriptors to a single syscall sounds convoluted.
>

It is a waste of fd using pipe buffer with two fds. In fact, I had
ever posted a patch, which extends pipe(2) to return a O_RDWR fd when
NULL is passed in.

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html