From: smoch@web.de (Soeren Moch)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] USB: EHCI: fix for leaking isochronous data
Date: Fri, 15 Mar 2013 01:00:04 +0100 [thread overview]
Message-ID: <51426484.3000609@web.de> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1303141719450.1194-100000@iolanthe.rowland.org>
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
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Bus 001 Device 006: ID 2304:0242 Pinnacle Systems, Inc.
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bInterval 1
Endpoint Descriptor:
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bEndpointAddress 0x83 EP 3 IN
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bInterval 4
Endpoint Descriptor:
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bEndpointAddress 0x84 EP 4 IN
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bInterval 1
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bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 7
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bInterfaceSubClass 0
bInterfaceProtocol 255
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Endpoint Descriptor:
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bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
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Synch Type None
Usage Type Data
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bInterval 11
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x1400 3x 1024 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x00c4 1x 196 bytes
bInterval 4
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x03ac 1x 940 bytes
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)
next prev parent reply other threads:[~2013-03-15 0:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.44L0.1302211337580.1529-100000@iolanthe.rowland.org>
2013-03-10 18:45 ` [PATCH] USB: EHCI: fix for leaking isochronous data Soeren Moch
2013-03-10 20:59 ` Alan Stern
2013-03-14 18:48 ` Soeren Moch
2013-03-14 20:22 ` Soeren Moch
2013-03-14 20:32 ` Alan Stern
2013-03-14 20:51 ` Soeren Moch
2013-03-14 21:33 ` Alan Stern
2013-03-15 0:00 ` Soeren Moch [this message]
2013-03-15 14:30 ` Alan Stern
2013-03-16 2:10 ` Soeren Moch
2013-03-16 17:39 ` Alan Stern
2013-03-17 16:56 ` Soeren Moch
2013-03-17 17:36 ` Alan Stern
2013-03-17 17:39 ` Alan Stern
2013-03-21 17:04 ` Soeren Moch
2013-03-21 17:33 ` Jason Cooper
2013-03-21 19:10 ` Arnd Bergmann
2013-03-21 19:34 ` Michael Trimarchi
2013-03-21 21:52 ` Soeren Moch
2013-03-21 21:06 ` Alan Stern
2013-03-21 21:12 ` Alan Stern
2013-03-21 21:20 ` Andrew Lunn
2013-03-21 22:16 ` Soeren Moch
2013-03-22 14:24 ` Alan Stern
2013-03-21 21:45 ` Soeren Moch
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