Author: hselasky
Date: Mon Oct 7 08:13:49 2019
New Revision: 353175
URL: https://svnweb.freebsd.org/changeset/base/353175
Log:
MFC r352555:
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
Modified:
stable/10/sys/dev/usb/usb_ioctl.h
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/dev/usb/usb_ioctl.h
==============================================================================
--- stable/10/sys/dev/usb/usb_ioctl.h Mon Oct 7 08:13:10 2019
(r353174)
+++ stable/10/sys/dev/usb/usb_ioctl.h Mon Oct 7 08:13:49 2019
(r353175)
@@ -218,7 +218,7 @@ 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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