IPoIB: Double default RX/TX ring sizes

Increase IPoIB ring sizes to twice their original sizes (RX: 128->256,
TX: 64->128) to act as a shock absorber for high traffic peaks.  With
the current settings, we have seen cases that there are many calls to
netif_stop_queue(), which causes degradation in throughput.  Also,
larger receive buffer sizes help IPoIB in CM mode to avoid experiencing
RNR NAK conditions due to insufficient receive buffers at the SRQ.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 0281c8fecc904e6caf849d9679d1a1549d50ab61..b0ffc9abe8c082fa1c32e112e8aa50d9e06bca83 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -70,8 +70,8 @@ enum {
        IPOIB_CM_BUF_SIZE         = IPOIB_CM_MTU  + IPOIB_ENCAP_LEN,
        IPOIB_CM_HEAD_SIZE        = IPOIB_CM_BUF_SIZE % PAGE_SIZE,
        IPOIB_CM_RX_SG            = ALIGN(IPOIB_CM_BUF_SIZE, PAGE_SIZE) / PAGE_SIZE,
-       IPOIB_RX_RING_SIZE        = 128,
-       IPOIB_TX_RING_SIZE        = 64,
+       IPOIB_RX_RING_SIZE        = 256,
+       IPOIB_TX_RING_SIZE        = 128,
        IPOIB_MAX_QUEUE_SIZE      = 8192,
        IPOIB_MIN_QUEUE_SIZE      = 2,
        IPOIB_CM_MAX_CONN_QP      = 4096,