Commit 3451712d authored Aug 11, 2014 by Azhar Shaikh

usb: gadget: Improve downlink throughput by enabling aggregation



There is low throughput of around 100Mbps for CAT6 seen on UDP-DL for
rmnet when using the u_ether transport.
Rmnet driver processes 10 USB requests at a time and then relinquishes
the CPU. Due to this implementation, network queue is being flow
controlled very often and also flow control is disabled after a
long time. Hence DL throughput decreases.
So aggregate 10 IP packets at a time and send in one USB request,
which improves the throughput from 100Mbps to 294Mbps.

CRs-fixed: 699603
Change-Id: I71c7f72c7c10a25bdcc50fc3d6859bff9555a500
Signed-off-by: Azhar Shaikh <azhars@codeaurora.org>

parent 408d933c

drivers/usb/gadget/f_rmnet.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -523,6 +523,8 @@ static int gport_rmnet_connect(struct f_rmnet *dev, unsigned intf)

		return PTR_ERR(net);
		}
		gether_update_dl_max_pkts_per_xfer(&dev->gether_port, 10);
		gether_update_dl_max_xfer_size(&dev->gether_port, 16384);
		break;
		case USB_GADGET_XPORT_NONE:
		break;