[hyperv] Increase TX ring size

Empirical observation suggests that 32 is a sensible size to minimise
the number of deferred packet transmissions without overflowing the
VMBus transmit ring buffer.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/drivers/net/netvsc.h b/src/drivers/net/netvsc.h
index 8375194d91d5fc8fba85cdc12b74393b91a20fad..277e08e311dac10048cbdbe18a4b08a298d7a5aa 100644 (file)
--- a/src/drivers/net/netvsc.h
+++ b/src/drivers/net/netvsc.h
@@ -24,7 +24,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
  * must be sufficiently small to guarantee that we never run out of
  * space in the VMBus outbound ring buffer.
  */
-#define NETVSC_TX_NUM_DESC 8
+#define NETVSC_TX_NUM_DESC 32
 
 /** RX data buffer page set ID
  *