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| author | David Engraf <david.engraf@netcom.eu> | 2008-03-20 10:01:34 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-04-25 06:16:44 +0200 |
| commit | e4cf3aa8f9cd6ee4d583b5d445b5c152acefcde4 (patch) | |
| tree | 1e1a442763c227bbe0c72952f8e5e599ecd30a97 /drivers/usb/class/cdc-acm.h | |
| parent | USB: cdc-acm tell tty layer not to split things up. (diff) | |
| download | linux-e4cf3aa8f9cd6ee4d583b5d445b5c152acefcde4.tar.xz linux-e4cf3aa8f9cd6ee4d583b5d445b5c152acefcde4.zip | |
USB: increase cdc-acm write throughput
the following patch uses 16 write urbs and a writsize of wMaxPacketSize
* 20. With this patch I get the maximum througput from my linux system
with 20MB/sec read and 15 MB/sec write (full speed 1 MB/sec both)
I also deleted the flag URB_NO_FSBR for the writeurbs, because this
makes my full speed devices significant slower.
Signed-off-by: David Engraf <david.engraf@netcom.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/class/cdc-acm.h')
| -rw-r--r-- | drivers/usb/class/cdc-acm.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/usb/class/cdc-acm.h b/drivers/usb/class/cdc-acm.h index 8df6a57dcf9e..046e064b033a 100644 --- a/drivers/usb/class/cdc-acm.h +++ b/drivers/usb/class/cdc-acm.h @@ -59,7 +59,7 @@ * when processing onlcr, so we only need 2 buffers. These values must be * powers of 2. */ -#define ACM_NW 2 +#define ACM_NW 16 #define ACM_NR 16 struct acm_wb { @@ -67,6 +67,8 @@ struct acm_wb { dma_addr_t dmah; int len; int use; + struct urb *urb; + struct acm *instance; }; struct acm_rb { @@ -88,7 +90,7 @@ struct acm { struct usb_interface *control; /* control interface */ struct usb_interface *data; /* data interface */ struct tty_struct *tty; /* the corresponding tty */ - struct urb *ctrlurb, *writeurb; /* urbs */ + struct urb *ctrlurb; /* urbs */ u8 *ctrl_buffer; /* buffers of urbs */ dma_addr_t ctrl_dma; /* dma handles of buffers */ u8 *country_codes; /* country codes from device */ @@ -103,7 +105,6 @@ struct acm { struct list_head spare_read_urbs; struct list_head spare_read_bufs; struct list_head filled_read_bufs; - int write_current; /* current write buffer */ int write_used; /* number of non-empty write buffers */ int write_ready; /* write urb is not running */ spinlock_t write_lock; |