Zero Copy writes for Samba

Kuhn, Steven skuhn at
Wed Feb 26 14:59:35 MST 2014

Ok.  Thank you for the reference.


From: Jeremy Allison [jra at]
Sent: Wednesday, February 26, 2014 1:51 PM
To: Kuhn, Steven
Cc: Jeremy Allison; samba-technical at
Subject: Re: Zero Copy writes for Samba

On Wed, Feb 26, 2014 at 09:48:16PM +0000, Kuhn, Steven wrote:
> Hi Jeremy,
> Thank you for your reply.
> I do not know if I have a modified kernel that fixes splice performance.  I have the OpenWrt 3.4.0 distribution.

Then you don't :-).

> What should I look for in the kernel to see if it has the modifications you are referring to?

No distribution has such a modified splice. Some
NAS products have experimented with this, but
no fixes have ever been deemed good or safe
enough to go into the mainline kernel.

> Can you point me to the kernel modifications to add myself?

There aren't any, that's the point :-(.

You're better off without splice. Use the aio_pthread
VFS module instead.

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