Commit bcf28d06 authored Jun 01, 2015 by Devdutt Patnaik Committed by Azhar Shaikh Dec 16, 2015

net: usbnet: Increase USB RX/TX qlen and IPA descriptor counts



Increase USB RX/TX qlens to improve TCP DL tput. In the case of
HSUSB the default qlen of 60 is inadequate as it results in
packet drops when IPA sends data at a high rate. This results
in TCP window collapse and poor tput. Also increase IPA UL
descriptor counts for better UL performance. This will help
improve TCP ACK performance for the DL case.

CRs-Fixed: 886212
Signed-off-by: Devdutt Patnaik <dpatnaik@codeaurora.org>
Change-Id: Iab583857a9e578bceed528a0348235abf367c78c

parent f205162c

drivers/net/usb/usbnet.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -63,7 +63,7 @@
		* more before an irq is required, under load. Jumbograms change
		* the equation.
		*/
		#define MAX_QUEUE_MEMORY (60 * 1518)
		#define MAX_QUEUE_MEMORY (600 * 1518)
		#define RX_QLEN(dev) ((dev)->rx_qlen)
		#define TX_QLEN(dev) ((dev)->tx_qlen)

include/linux/usb/usbnet.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -24,7 +24,7 @@

		#include <linux/ipa.h>

		#define USBNET_IPA_SYS_PIPE_MAX_PKTS_DESC 160
		#define USBNET_IPA_SYS_PIPE_MAX_PKTS_DESC 200
		#define USBNET_IPA_SYS_PIPE_MIN_PKTS_DESC 5
		#define USBNET_IPA_SYS_PIPE_DNE_PKTS (USBNET_IPA_SYS_PIPE_MAX_PKTS_DESC*2)