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SubjectRe: [PATCH] USB: EHCI: fix for leaking isochronous data
On 14.03.2013 22:33, Alan Stern wrote:
> On Thu, 14 Mar 2013, Soeren Moch wrote:
>
>>> If the memory really is being leaked here in some sort of systematic
>>> way, we may be able to see it in your debugging output after a few
>>> seconds.
>>>
>>
>> OK, here are the first seconds of the log. But the buffer exhaustion
>> usually occurs after several hours of runtime...
>
> The log shows a 1-1 match between allocations and deallocations, except
> for three excess allocations about 45 lines before the end. I have no
> idea what's up with those. They may be an artifact arising from where
> you stopped copying the log data.
>
> There are as many as 400 iTDs being allocated before any are freed.
> That seems like a lot. Are they all for the same isochronous endpoint?
> What's the endpoint's period? How often are URBs submitted?

I use 2 dvb sticks, capturing digital TV. For each stick 5 URBs on a
single endpoint are used, I think. I'm not sure, which endpoint in which
alternateSetting is active. I attached the output of 'lsusb -v' for the
sticks.
How can I track down the other information you need?

> In general, there shouldn't be more than a couple of millisecond's
> worth of iTDs allocated for any endpoint, depending on how many URBs
> are in the pipeline at any time.

Maybe the em28xx driver is not doing a good job here!?

Soeren Moch

> Maybe a better way to go about this is, instead of printing out every
> allocation and deallocation, to keep a running counter. You could have
> the driver print out the value of this counter every minute or so. Any
> time the device isn't in use, the counter should be 0.
>
> Alan Stern



Bus 001 Device 005: ID 0ccd:00b2 TerraTec Electronic GmbH
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
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bMaxPacketSize0 64
idVendor 0x0ccd TerraTec Electronic GmbH
idProduct 0x00b2
bcdDevice 1.00
iManufacturer 3 TERRATEC
iProduct 1 Cinergy HTC Stick
iSerial 2 123456789ABCD
bNumConfigurations 1
Configuration Descriptor:
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bDescriptorType 2
wTotalLength 305
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bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
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bcdUSB 2.00
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bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)

Bus 001 Device 006: ID 2304:0242 Pinnacle Systems, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x2304 Pinnacle Systems, Inc.
idProduct 0x0242
bcdDevice 1.00
iManufacturer 1 Pinnacle Systems
iProduct 2 PCTV 510e
iSerial 3 123456789012
bNumConfigurations 1
Configuration Descriptor:
bLength 9
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iConfiguration 0
bmAttributes 0x80
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bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
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bInterval 1
Endpoint Descriptor:
bLength 7
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bmAttributes 1
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bInterval 4
Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
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Synch Type None
Usage Type Data
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bInterval 1
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)



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