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xen-netback: process guest rx packets in batches 

Instead of only placing one skb on the guest rx ring at a time, process
a batch of up-to 64.  This improves performance by ~10% in some tests.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
[re-based]
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Vrabel 2016-10-04 10:29:16 +01:00 committed by David S. Miller
parent 7c0b1a23e6
commit 98f6d57ced
1 changed files with 14 additions and 1 deletions
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15
drivers/net/xen-netback/rx.c
View File

@ -399,7 +399,7 @@ static void xenvif_rx_extra_slot(struct xenvif_queue *queue,
BUG();
}
void xenvif_rx_action(struct xenvif_queue *queue)
void xenvif_rx_skb(struct xenvif_queue *queue)
{
struct xenvif_pkt_state pkt;
@ -425,6 +425,19 @@ void xenvif_rx_action(struct xenvif_queue *queue)
xenvif_rx_complete(queue, &pkt);
}
#define RX_BATCH_SIZE 64
void xenvif_rx_action(struct xenvif_queue *queue)
{
unsigned int work_done = 0;
while (xenvif_rx_ring_slots_available(queue) &&
work_done < RX_BATCH_SIZE) {
xenvif_rx_skb(queue);
work_done++;
}
}
static bool xenvif_rx_queue_stalled(struct xenvif_queue *queue)
{
RING_IDX prod, cons;