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
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Device Status: 0x0000
(Bus Powered)
Bus 001 Device 006: ID 2304:0242 Pinnacle Systems, Inc.
Device Descriptor:
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bDeviceSubClass 0
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idVendor 0x2304 Pinnacle Systems, Inc.
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iManufacturer 1 Pinnacle Systems
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bInterval 1
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bDescriptorType 6
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bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
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