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: <20090828230623.GD8036@shareable.org>
Date:	Sat, 29 Aug 2009 00:06:23 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Ulrich Drepper <drepper@...hat.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: adding proper O_SYNC/O_DSYNC, was Re: O_DIRECT and barriers

Christoph Hellwig wrote:
>  - given that our current O_SYNC really is and always has been actuall
>    Posix O_DSYNC

Are you sure about this?

>From http://www-01.ibm.com/support/docview.wss?uid=isg1IZ01704 :

    Error description

       LINUX O_DIRECT/O_SYNC TAKES TOO MANY IOS

    Problem summary

       On AIX, the O_SYNC and O_DSYNC are different values and
       performance improvement are available because the inode does
       not need to be flushed for mtime changes only.
       On Linux the flags are the same, so performance is lost.
       when databases open files with O_DIRECT and O_SYNC.

-- Jamie
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ