Fwd: [PATCH 0/6] Extended file stat system call

Steve French smfrench at gmail.com
Fri Apr 27 18:56:20 MDT 2012

---------- Forwarded message ----------
From: Steve French <smfrench at gmail.com>
Date: Fri, Apr 27, 2012 at 7:54 PM
Subject: Re: [PATCH 0/6] Extended file stat system call
To: Dave Chinner <david at fromorbit.com>
Cc: Andreas Dilger <adilger at whamcloud.com>, David Howells
<dhowells at redhat.com>, linux-fsdevel at vger.kernel.org,
linux-nfs at vger.kernel.org, linux-cifs at vger.kernel.org,
samba-technical at lists.samba.org, linux-ext4 at vger.kernel.org,
wine-devel at winehq.org, linux-api at vger.kernel.org,
libc-alpha at sourceware.org

On Fri, Apr 27, 2012 at 7:38 PM, Dave Chinner <david at fromorbit.com> wrote:
> preferred minimum IO size (mp->m_readio_log/mp->m_writeio_log)

This discussion about i/o sizes is very interesting.   For network
file system (at least for SMB2 to all known servers, and
for cifs mounts to Samba, but probably for recent NFS), ideal i/o
sizes are often well over a megabyte ... but how to indicate that to
the application...

> That's why I'd prefer specific optimal IO hints - we don't have to
> overload st_blksize with lots of meanings to pass what is relatively
> trivial information back to the application.
> Cheers,
> Dave.
> --
> Dave Chinner






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