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]

Date:	Tue, 13 Jul 2010 21:58:00 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Ofer Heifetz <oferh@...vell.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Jens Axboe <axboe@...nel.dk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Splice status

On Tue, Jul 13, 2010 at 8:42 PM, Ofer Heifetz <oferh@...vell.com> wrote:
> Write and re-write numbers are in MBps.
> Iozone performs re-write meaning reads a chunk of data and writes it back, so basically the performance for this operation should be quiet high since kernel caches usage.
>
> I forgot to mention that I used EXT4 fs.

Maybe it is caused by this line in generic_file_splice_write():

                balance_dirty_pages_ratelimited_nr(mapping, nr_pages);

Please try to test it again without this line.

-- 
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