From: Stephen Hemminger <stephen@networkplumber.org>
Date: Fri, 10 Aug 2018 23:06:09 +0000
Patch-mainline: v4.20-rc1
Subject: uio_hv_generic: increase size of receive and send buffers
Git-commit: 108ddb8fa1fc310be4a6bd1e308bca62821ee8b5
References: fate#323887

When using DPDK there is significant performance boost by using
the largest possible send and receive buffer area.

Unfortunately, with UIO model there is not a good way to configure
this at run time. But it is okay to have a bigger buffer available
even if application only decides to use a smaller piece of it.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Olaf Hering <ohering@suse.de>
---
 drivers/uio/uio_hv_generic.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -33,13 +33,13 @@
 
 #include "../hv/hyperv_vmbus.h"
 
-#define DRIVER_VERSION	"0.02.0"
+#define DRIVER_VERSION	"0.02.1"
 #define DRIVER_AUTHOR	"Stephen Hemminger <sthemmin at microsoft.com>"
 #define DRIVER_DESC	"Generic UIO driver for VMBus devices"
 
 #define HV_RING_SIZE	 512	/* pages */
-#define SEND_BUFFER_SIZE (15 * 1024 * 1024)
-#define RECV_BUFFER_SIZE (15 * 1024 * 1024)
+#define SEND_BUFFER_SIZE (16 * 1024 * 1024)
+#define RECV_BUFFER_SIZE (31 * 1024 * 1024)
 
 /*
  * List of resources to be mapped to user space