netvsc: increase default receive buffer size

The default receive buffer size was reduced by recent change
to a value which was appropriate for 10G and Windows Server 2016.
But the value is too small for full performance with 40G on Azure.
Increase the default back to maximum supported by host.

Fixes: 8b5327975ae1 ("netvsc: allow controlling send/recv buffer size")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index c538a4f..d4902ee 100644 (file)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -49,7 +49,7 @@
 #define NETVSC_MIN_TX_SECTIONS 10
 #define NETVSC_DEFAULT_TX      192     /* ~1M */
 #define NETVSC_MIN_RX_SECTIONS 10      /* ~64K */
-#define NETVSC_DEFAULT_RX      2048    /* ~4M */
+#define NETVSC_DEFAULT_RX      10485   /* Max ~16M */
 
 #define LINKCHANGE_INT (2 * HZ)
 #define VF_TAKEOVER_INT (HZ / 10)