On Wed, Jan 15, 2014 at 05:11:07PM +0000, Zoltan Kiss wrote: > The recent patch to fix receive side flow control (11b57f) solved the spinning > thread problem, however caused an another one. The receive side can stall, if: > - [THREAD] xenvif_rx_action sets rx_queue_stopped to true > - [INTERRUPT] interrupt happens, and sets rx_event to true > - [THREAD] then xenvif_kthread sets rx_event to false > - [THREAD] rx_work_todo doesn't return true anymore > > Also, if interrupt sent but there is still no room in the ring, it take quite > a > long time until xenvif_rx_action realize it. This patch ditch that two > variable, > and rework rx_work_todo. If the thread finds it can't fit more skb's into the > ring, it saves the last slot estimation into rx_last_skb_slots, otherwise it's > kept as 0. Then rx_work_todo will check if: > - there is something to send to the ring (like before) > - there is space for the topmost packet in the queue > > I think that's more natural and optimal thing to test than two bool which are > set somewhere else. > > Signed-off-by: Zoltan Kiss <zoltan.k...@citrix.com>
Sorry for the delay. Paul, thanks for reviewing. Acked-by: Wei Liu <wei.l...@citrix.com> Wei. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
