netdev - Re: Splice status

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]

Message-ID: <4C4DF220.1050307@gmail.com>
Date:	Mon, 26 Jul 2010 22:37:52 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Ofer Heifetz <oferh@...vell.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	Changli Gao <xiaosuo@...il.com>, Jens Axboe <axboe@...nel.dk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Splice status

Ofer Heifetz wrote, On 25.07.2010 16:47:

> Hi Eric,
> 
> Still trying to get better performance with splice, I noticed that when using splice there are twice the file size memcpy (placed a counter in memcpy), I verified it via samba file transfer and splice-fromnet/out.
> 
> I also used the splice-fromnet/out and using ftrace I did notice that data is copied twice using these routines: skb_splice_bits, pipe_to_file.


I'm not sure you're using optimal NIC for splice, which should use
skbs with almost all data paged (non-linear), like niu or myri10ge.

Jarek P.
--
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