From: David Howells <dhowells@redhat.com>
To: Dave Chinner <david@fromorbit.com>
Cc: dhowells@redhat.com, adilger@dilger.ca, bfields@fieldses.org,
smfrench@gmail.com, ben@decadent.org.uk,
Trond.Myklebust@netapp.com, roland@hack.frob.com,
linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org,
linux-cifs@vger.kernel.org, samba-technical@lists.samba.org,
linux-ext4@vger.kernel.org, linux-api@vger.kernel.org,
libc-alpha@sourceware.org
Subject: Re: Extended file stat: Splitting file- and fs-specific info?
Date: Thu, 10 May 2012 10:14:11 +0100 [thread overview]
Message-ID: <13791.1336641251@redhat.com> (raw)
In-Reply-To: <20120509002420.GL5091@dastard>
Dave Chinner <david@fromorbit.com> wrote:
> > Also, do Dave Chinner's ideas for indicating five I/O parameters want to be
> > 32-bit numbers? Larger? Smaller? Can they be log2?
>
> Definitely 32 bit, IMO, as it's not uncommon to see optimal IO sizes
> in the tens of megabytes on large, high bandwidth storage systems.
> As for being log2 - that's just making it more complex to use and
> making code ugly - we'd have to convert to log2 in kernel, then
> convert back in every single application....
ilog2() in the kernel uses the CPU's bit-scan instruction if it has one and
converting back is just a bitshift operator.
But let's go with 32-bit fields for the moment. I presume we aren't worried
about a driver that wants to do a 4GB transfer...
David
prev parent reply other threads:[~2012-05-10 9:14 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 14:05 [PATCH 0/6] Extended file stat system call David Howells
2012-04-19 14:06 ` [PATCH 1/6] xstat: Add a pair of system calls to make extended file stats available David Howells
2012-04-19 23:36 ` Andreas Dilger
2012-04-24 21:29 ` J. Bruce Fields
2012-04-24 22:08 ` Steve French
2012-04-25 14:44 ` Andreas Dilger
2012-04-26 13:45 ` David Howells
2012-04-26 14:28 ` J. Bruce Fields
2012-04-26 17:06 ` Steve French
2012-04-26 13:32 ` David Howells
2012-04-27 0:51 ` Dave Chinner
2012-04-27 3:11 ` Andreas Dilger
2012-04-26 13:40 ` David Howells
2012-04-26 14:23 ` J. Bruce Fields
2012-04-19 14:06 ` [PATCH 2/6] xstat: Ext4: Return extended attributes David Howells
2012-04-19 16:03 ` Steve French
2012-04-26 13:47 ` David Howells
2012-04-26 17:00 ` Steve French
2012-04-19 14:06 ` [PATCH 3/6] xstat: AFS: " David Howells
2012-04-19 14:06 ` [PATCH 4/6] xstat: NFS: " David Howells
2012-04-19 14:35 ` Myklebust, Trond
2012-04-26 13:52 ` David Howells
2012-04-19 14:07 ` [PATCH 5/6] xstat: CIFS: " David Howells
2012-04-19 15:19 ` Steve French
2012-04-19 14:07 ` [PATCH 6/6] xstat: eCryptFS: " David Howells
2012-04-19 16:32 ` [PATCH 0/6] Extended file stat system call Roland McGrath
2012-04-19 21:51 ` Paul Eggert
2012-04-19 23:05 ` Roland McGrath
2012-04-26 14:16 ` David Howells
2012-04-26 18:22 ` Roland McGrath
2012-04-26 14:04 ` David Howells
2012-04-26 18:24 ` Roland McGrath
2012-04-19 17:11 ` Steve French
2012-04-19 23:29 ` Andreas Dilger
2012-04-26 13:54 ` David Howells
2012-04-26 18:25 ` Roland McGrath
2012-04-27 23:54 ` Paul Eggert
2012-04-26 21:54 ` David Howells
2012-04-26 22:02 ` Roland McGrath
2012-04-26 22:21 ` Nix
2012-04-26 14:25 ` David Howells
2012-04-26 14:54 ` Steve French
2012-04-26 15:25 ` Myklebust, Trond
2012-04-26 16:56 ` Steve French
2012-04-26 17:00 ` Myklebust, Trond
2012-04-26 17:03 ` Steve French
2012-04-26 17:06 ` Myklebust, Trond
2012-04-26 17:09 ` Steve French
2012-04-26 17:10 ` Steve French
2012-04-26 21:57 ` David Howells
2012-04-26 22:05 ` Roland McGrath
2012-04-27 0:33 ` Myklebust, Trond
2012-04-27 0:30 ` Myklebust, Trond
2012-04-26 15:52 ` David Howells
2012-04-27 0:29 ` Andreas Dilger
2012-04-27 9:19 ` David Howells
2012-04-27 1:06 ` Dave Chinner
2012-04-27 3:22 ` Andreas Dilger
2012-04-28 0:38 ` Dave Chinner
2012-04-28 0:54 ` Steve French
2012-04-27 9:39 ` David Howells
2012-04-27 13:13 ` Dave Chinner
2012-04-27 15:10 ` J. Bruce Fields
2012-04-27 16:32 ` Steve French
2012-04-27 19:31 ` Andreas Dilger
2012-04-28 0:58 ` Dave Chinner
2012-05-10 9:51 ` David Howells
2012-05-08 20:19 ` Extended file stat: Splitting file- and fs-specific info? David Howells
2012-05-08 21:13 ` Myklebust, Trond
2012-05-09 0:24 ` Dave Chinner
2012-05-09 1:09 ` J. Bruce Fields
2012-05-09 4:25 ` Dave Chinner
2012-05-09 11:14 ` J. Bruce Fields
2012-05-09 1:16 ` Andreas Dilger
2012-05-10 9:23 ` David Howells
2012-05-10 16:05 ` Andreas Dilger
2012-05-10 17:10 ` Roland McGrath
2012-05-11 8:54 ` Andreas Dilger
2012-05-09 9:21 ` David Howells
2012-05-09 11:19 ` Christoph Hellwig
2012-05-09 11:55 ` Bernd Schubert
2012-05-09 12:05 ` Christoph Hellwig
2012-05-09 12:25 ` Bernd Schubert
2012-05-09 13:51 ` Andreas Dilger
2012-05-09 14:12 ` Bernd Schubert
2012-05-10 9:14 ` David Howells [this message]
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