Re: [PATCH RFC v2] Performing direct I/O on sector-aligned requests

----- Original Message -----

From: "Dean" <redacted>
To: "Alexandre Depoutovitch" <redacted>
Cc: linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Sent: Friday, May 11, 2012 2:36:52 PM
Subject: Re: [PATCH RFC v2] Performing direct I/O on sector-aligned requests



On 4/29/12 2:03 PM, Alexandre Depoutovitch wrote:

quoted

A new flag is exposed to users through /proc/fs/nfsd/direct_io
node. The
default value of 1 results in the above behavior. Writing 0 to the
node
turns off the direct I/O completely, and forces NFS daemon to
always use
buffered IO (as it has done before). Writing 2 to the node tells
NFS
daemon to use direct I/O whenever possible, even if  requests are
aligned
at file system block boundary.

Not sure if this was previously discussed, but I assume the default
would remain the same (value 0)?

Dean

Yes. The default should be 0 (the behavior will not change, unless the user explicitly enables it).