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  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:	Thu, 31 May 2007 08:36:50 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Neil Brown <neilb@...e.de>
Cc:	David Chinner <dgc@....com>, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org, nfsv4@...ux-nfs.org,
	Jean noel Cordenner <jean-noel.cordenner@...l.net>
Subject: Re: [patch 0/2] i_version update

On Thu, 2007-05-31 at 10:01 +1000, Neil Brown wrote:

> This will provide a change number that normally changes only when the
> file changes and doesn't require any extra storage on disk.
> The change number will change inappropriately only when the inode has
> fallen out of cache and is being reload, which is either after a crash
> (hopefully rare) of when a file hasn't been used for a while, implying
> that it is unlikely that any client has it in cache.

It will also change inappropriately if the server is under heavy load
and needs to reclaim memory by tossing out inodes that are cached and
still in use by the clients. That change will trigger clients to
invalidate their caches and to refetch the data from the server, further
cranking up the load.

Not an ideal solution...

Trond

-
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists