Messages in this thread | | | Date | Mon, 2 May 2011 22:53:03 +0300 | From | "Michael S. Tsirkin" <> | Subject | Re: [PATCH V3 2/8] Add a new zerocopy device flag |
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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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