From 913eb8bf874fcec647667bd7113da65b6e38488a Mon Sep 17 00:00:00 2001 From: David Krause Date: Tue, 8 Mar 2011 14:10:16 +0800 Subject: Enlarge USB bulk transfer size for faster downloads The default USB transfer bulk is fixed as 4096 in fastboot util code for Windows and Linux. Enlarging the bulk size can greatly improve the image download speed via USB. For Windows, adjust the max bulk size to 1MB to maximize the USB transfer speed. With this change, the USB transfer speed can be doubled to 20MB/s. For Linux, adjust the max bulk size to 16384 to maximize the USB transfer speed according to MAX_USBFS_BUFFER_SIZE definition in drivers/usb/core/devio.c. For OSX, the maxLenToSend is already 1MB in code. Change-Id: If6af8c6301f6f6c2ef345e37241706f16d8f5cda --- fastboot/usb_linux.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'fastboot/usb_linux.c') diff --git a/fastboot/usb_linux.c b/fastboot/usb_linux.c index 78b7b98..1ba87e6 100644 --- a/fastboot/usb_linux.c +++ b/fastboot/usb_linux.c @@ -61,6 +61,11 @@ #define DBG1(x...) #endif +/* The max bulk size for linux is 16384 which is defined + * in drivers/usb/core/devio.c. + */ +#define MAX_USBFS_BULK_SIZE (16 * 1024) + struct usb_handle { char fname[64]; @@ -289,7 +294,7 @@ int usb_write(usb_handle *h, const void *_data, int len) while(len > 0) { int xfer; - xfer = (len > 4096) ? 4096 : len; + xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len; bulk.ep = h->ep_out; bulk.len = xfer; @@ -323,7 +328,7 @@ int usb_read(usb_handle *h, void *_data, int len) } while(len > 0) { - int xfer = (len > 4096) ? 4096 : len; + int xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len; bulk.ep = h->ep_in; bulk.len = xfer; -- cgit v1.1