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SubjectRe: [PATCH V3 2/8] Add a new zerocopy device flag
On Mon, May 02, 2011 at 11:47:08AM -0700, Shirley Ma wrote:
> On Mon, 2011-05-02 at 13:42 +0300, Michael S. Tsirkin wrote:
> > This comment should specify what exactly is the promise the
> > device makes by setting this flag. Specifically, the
> > condition is that no skb fragments are used
> > after the uinfo callback has been called.
> >
> > The way it's implemented, it probably means the device
> > should not use any of skb_clone, expand head etc.
>
> Agree. Or maybe force a copy when device uses skb_clone, expand
> head ...?
>
> Thanks
> Shirley

Copy from userspace upfront without locking is probably cheaper?

--
MST


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