Messages in this thread | | | Date | Wed, 26 Mar 2014 16:33:54 -0400 (EDT) | Subject | Re: [PATCH net-next v3 1/3] xen-netback: Stop using xenvif_tx_pending_slots_available | From | David Miller <> |
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From: Zoltan Kiss <zoltan.kiss@citrix.com> Date: Mon, 24 Mar 2014 23:59:49 +0000
> Since the early days TX stops if there isn't enough free pending slots to > consume a maximum sized (slot-wise) packet. Probably the reason for that is to > avoid the case when we don't have enough free pending slot in the ring to finish > the packet. But if we make sure that the pending ring has the same size as the > shared ring, that shouldn't really happen. The frontend can only post packets > which fit the to the free space of the shared ring. If it doesn't, the frontend > has to stop, as it can only increase the req_prod when the whole packet fits > onto the ring. > This patch avoid using this checking, makes sure the 2 ring has the same size, > and remove a checking from the callback. As now we don't stop the NAPI instance > on this condition, we don't have to wake it up if we free pending slots up. > > Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Applied.
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