Author: hselasky
Date: Fri Sep 20 11:00:02 2019
New Revision: 352555
URL: https://svnweb.freebsd.org/changeset/base/352555
Log:
Increase the maximum user-space buffer size from 256kBytes to 32MBytes for
libusb. This is useful for speeding up large data transfers while reducing
the interrupt rate.
Found at: EuroBSDcon 2019
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/dev/usb/usb_ioctl.h
Modified: head/sys/dev/usb/usb_ioctl.h
==============================================================================
--- head/sys/dev/usb/usb_ioctl.h Fri Sep 20 10:56:13 2019
(r352554)
+++ head/sys/dev/usb/usb_ioctl.h Fri Sep 20 11:00:02 2019
(r352555)
@@ -224,7 +224,7 @@ struct usb_fs_uninit {
} USB_IOCTL_STRUCT_ALIGN(1);
struct usb_fs_open {
-#define USB_FS_MAX_BUFSIZE (1 << 18)
+#define USB_FS_MAX_BUFSIZE (1 << 25) /* 32 MBytes */
uint32_t max_bufsize;
#define USB_FS_MAX_FRAMES (1U << 12)
#define USB_FS_MAX_FRAMES_PRE_SCALE (1U << 31) /* for
ISOCHRONOUS transfers */
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