Hey, On 22/07/15 01:34, Peter Hurley wrote: > I'd like to see that data, if you can, which will help me understand > at least the timing. Sure, please see below for the code which produced the output and the actual output. Let me know if you need anything else. This was run with the unmodified version of the driver, i.e. without my patch.
Sven
------
Code which produced the output:
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 5c8f581..3d26c87 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -404,12 +404,16 @@ static int acm_submit_read_urbs(struct acm *acm, gfp_t
mem_flags)
static void acm_process_read_urb(struct acm *acm, struct urb *urb)
{
+ int written;
+
if (!urb->actual_length)
return;
- tty_insert_flip_string(&acm->port, urb->transfer_buffer,
+ written = tty_insert_flip_string(&acm->port, urb->transfer_buffer,
urb->actual_length);
tty_flip_buffer_push(&acm->port);
+ printk("cdc-acm: acm_process_read_urb: processed %d of %d (free space
left: %d)\n",
+ written, urb->actual_length, tty_buffer_space_avail(&acm->port));
}
static void acm_read_bulk_callback(struct urb *urb)
@@ -448,6 +452,9 @@ static void acm_read_bulk_callback(struct urb *urb)
/* throttle device if requested by tty */
spin_lock_irqsave(&acm->read_lock, flags);
acm->throttled = acm->throttle_req;
+ if (acm->throttle_req) {
+ printk("cdc-acm: acm_read_bulk_callback: throttle requested\n");
+ }
if (!acm->throttled) {
spin_unlock_irqrestore(&acm->read_lock, flags);
acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
@@ -758,6 +765,9 @@ static void acm_tty_throttle(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
+ printk("cdc-acm: acm_tty_throttle: called; free space in tty: %d\n",
+ tty_buffer_space_avail(&acm->port));
+
spin_lock_irq(&acm->read_lock);
acm->throttle_req = 1;
spin_unlock_irq(&acm->read_lock);
@@ -768,6 +778,9 @@ static void acm_tty_unthrottle(struct tty_struct *tty)
struct acm *acm = tty->driver_data;
unsigned int was_throttled;
+ printk("cdc-acm: acm_tty_unthrottle: called; free space in tty: %d\n",
+ tty_buffer_space_avail(&acm->port));
+
spin_lock_irq(&acm->read_lock);
was_throttled = acm->throttled;
acm->throttled = 0;
______________________________
Output from dmesg (cut a bit in the beginning):
[...]
[62517.602478] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.602480] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.602483] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62208)
[62517.602485] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62208)
[62517.602487] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61184)
[62517.602489] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61184)
[62517.602494] cdc-acm: acm_tty_throttle: called; free space in tty: 63488
[62517.602600] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.602602] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.602603] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.602604] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.602606] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.602607] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.602609] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.602610] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.602612] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 60416)
[62517.602613] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.602726] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.602727] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.602729] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.602730] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.602731] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.602732] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.602734] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.602735] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.602737] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.602738] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.602959] cdc-acm: acm_tty_unthrottle: called; free space in tty: 64512
[62517.603852] cdc-acm: acm_process_read_urb: processed 16 of 16 (free space
left: 64256)
[62517.603856] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.603858] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.603976] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.603979] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.603981] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.603983] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.603985] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.603991] cdc-acm: acm_tty_throttle: called; free space in tty: 63488
[62517.604101] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 64512)
[62517.604103] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.604105] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.604105] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.604107] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.604108] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.604110] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.604111] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.604113] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.604115] cdc-acm: acm_tty_unthrottle: called; free space in tty: 62464
[62517.604121] cdc-acm: acm_tty_throttle: called; free space in tty: 64512
[62517.604227] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.604228] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.604230] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.604231] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.604233] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.604234] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.604235] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.604236] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.604375] cdc-acm: acm_tty_unthrottle: called; free space in tty: 64512
[62517.605355] cdc-acm: acm_process_read_urb: processed 16 of 16 (free space
left: 64256)
[62517.605358] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.605360] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.605362] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62208)
[62517.605364] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62208)
[62517.605371] cdc-acm: acm_tty_throttle: called; free space in tty: 64512
[62517.605478] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.605479] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605481] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.605482] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605484] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.605485] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605487] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.605488] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605490] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.605491] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605602] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.605603] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605605] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.605606] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605608] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.605609] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605610] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.605611] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605613] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.605614] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605726] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.605728] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605729] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.605730] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.605891] cdc-acm: acm_tty_unthrottle: called; free space in tty: 64512
[62517.606858] cdc-acm: acm_process_read_urb: processed 16 of 16 (free space
left: 64256)
[62517.606862] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.606864] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.606866] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62208)
[62517.606868] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62208)
[62517.606871] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61184)
[62517.606873] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61184)
[62517.606881] cdc-acm: acm_tty_throttle: called; free space in tty: 63488
[62517.606978] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.606980] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.606982] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.606983] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.606985] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.606986] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.606987] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.606988] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.606990] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 60416)
[62517.606991] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.607102] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.607104] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.607106] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.607107] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.607108] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.607109] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.607111] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 60416)
[62517.607112] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.607114] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 60416)
[62517.607115] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.607414] cdc-acm: acm_tty_unthrottle: called; free space in tty: 64512
[62517.608229] cdc-acm: acm_process_read_urb: processed 16 of 16 (free space
left: 64256)
[62517.608232] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.608234] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.608236] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62208)
[62517.608353] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 64512)
[62517.608356] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.608358] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.608361] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.608363] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.608401] cdc-acm: acm_tty_throttle: called; free space in tty: 64512
[62517.608480] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.608481] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.608483] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.608484] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.608485] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.608486] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.608488] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62464)
[62517.608489] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.608491] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61440)
[62517.608492] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.608603] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 64512)
[62517.608604] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.608606] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.608607] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.608609] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63488)
[62517.608610] cdc-acm: acm_read_bulk_callback: throttle requested
[62517.608691] cdc-acm: acm_tty_unthrottle: called; free space in tty: 64512
[62517.609738] cdc-acm: acm_process_read_urb: processed 16 of 16 (free space
left: 64256)
[62517.609743] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.609747] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 63232)
[62517.609750] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62208)
[62517.609754] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 62208)
[62517.609757] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61184)
[62517.609855] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 61184)
[62517.609859] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 60160)
[62517.609862] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 60160)
[62517.609866] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 59136)
[62517.610023] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 59136)
[62517.610030] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 58112)
[62517.610035] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 58112)
[62517.610040] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 57088)
[62517.610106] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 57088)
[62517.610110] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 56064)
[62517.610113] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 56064)
[62517.611115] cdc-acm: acm_process_read_urb: processed 16 of 16 (free space
left: 55808)
[62517.611119] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 54784)
[62517.611231] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 54784)
[62517.611236] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 53760)
[62517.611240] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 53760)
[62517.611243] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 52736)
[62517.611247] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 52736)
[62517.611386] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 51712)
[62517.611391] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 51712)
[62517.611396] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 50688)
[62517.611401] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 50688)
[62517.611406] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 49664)
[62517.611482] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 49664)
[62517.611489] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 48640)
[62517.611493] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 48640)
[62517.611606] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 47616)
[62517.611609] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 47616)
[62517.612610] cdc-acm: acm_process_read_urb: processed 16 of 16 (free space
left: 47360)
[62517.612615] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 46336)
[62517.612618] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 46336)
[62517.612622] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 45312)
[62517.612734] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 45312)
[62517.612738] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 44288)
[62517.612741] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 44288)
[62517.612745] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 43264)
[62517.612859] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 43264)
[62517.612862] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
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[62517.612866] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 42240)
[62517.612869] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 41216)
[62517.612981] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 41216)
[62517.612984] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 40192)
[62517.612987] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 40192)
[62517.612991] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 39168)
[62517.613106] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 39168)
[62517.614111] cdc-acm: acm_process_read_urb: processed 16 of 16 (free space
left: 38912)
[62517.614116] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 37888)
[62517.614119] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 37888)
[62517.614124] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 36864)
[62517.614127] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 36864)
[62517.614130] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 35840)
[62517.614232] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 35840)
[62517.614235] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
space left: 34816)
[62517.614239] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
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[62517.614247] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
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[62517.614359] cdc-acm: acm_process_read_urb: processed 1024 of 1024 (free
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signature.asc
Description: OpenPGP digital signature
