Author: hselasky
Date: Mon Oct 7 15:25:00 2019
New Revision: 353278
URL: https://svnweb.freebsd.org/changeset/base/353278
Log:
MFS r353173:
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
Sponsored by: Mellanox Technologies
Approved by: re (gjb)
Modified:
releng/12.1/sys/dev/usb/usb_ioctl.h
Directory Properties:
releng/12.1/ (props changed)
Modified: releng/12.1/sys/dev/usb/usb_ioctl.h
==============================================================================
--- releng/12.1/sys/dev/usb/usb_ioctl.h Mon Oct 7 15:03:24 2019
(r353277)
+++ releng/12.1/sys/dev/usb/usb_ioctl.h Mon Oct 7 15:25:00 2019
(r353278)
@@ -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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