Spurious DataDiscarded errors when streaming from cameras

[strohel]

Filing this to track an issue discovered in #153 (comment) - that PayloadReceiver::*recv*() methods sometimes spuriously return InvalidPayload("trailer status indicates error: DataDiscarded") error.

The error is recoverable and not really frequent, so this is definitely not critical.

To reproduce:

1. Run the stream example with current main

We now see this has been "always" happening for us at a slow rate (with occassional clusters of higher frequency) with the 0.1.8 release (mind logarithmic axis, truncated error string):

Tonari's internal tracking issue https://github.com/tonarino/portal/issues/2344.

Meta

• Which manufacturer's camera did you use? What is the model name of the camera?
  • iDS U3-388xLE-C, Omron STC-BCS642U3V-BL (@bschwind please correct me if I'm wrong)
• Which Cameleon version are you using?
  • 0.1.8, https://github.com/tonarino/cameleon/tree/recv-blocking @ 186525d, https://github.com/Y-Nak/cameleon/tree/test-stream @ 72489df

[Y-Nak]

Could you re-run the same script with the current main if it's not so much trouble? I'm really interested in the outcome.

[strohel]

@Y-Nak with 1023142 (current main) I still sometimes get:

     Running `target/debug/examples/stream`
payload receive error: invalid payload has been sent: trailer status indicates error: DataDiscarded
payload receive error: invalid payload has been sent: trailer status indicates error: DataDiscarded
payload receive error: invalid payload has been sent: trailer status indicates error: DataDiscarded
payload received! block_id: 3, timestamp: 285321.20223315s
ImageInfo { width: 3088, height: 2076, x_offset: 0, y_offset: 0, pixel_format: BayerRG8, image_size: 6410688 }

payload received! block_id: 4, timestamp: 285321.2222338s
ImageInfo { width: 3088, height: 2076, x_offset: 0, y_offset: 0, pixel_format: BayerRG8, image_size: 6410688 }

payload received! block_id: 5, timestamp: 285321.2422345s
ImageInfo { width: 3088, height: 2076, x_offset: 0, y_offset: 0, pixel_format: BayerRG8, image_size: 6410688 }

payload received! block_id: 6, timestamp: 285321.26223515s
ImageInfo { width: 3088, height: 2076, x_offset: 0, y_offset: 0, pixel_format: BayerRG8, image_size: 6410688 }

payload received! block_id: 7, timestamp: 285321.28223585s
ImageInfo { width: 3088, height: 2076, x_offset: 0, y_offset: 0, pixel_format: BayerRG8, image_size: 6410688 }

payload received! block_id: 8, timestamp: 285321.3022365s
ImageInfo { width: 3088, height: 2076, x_offset: 0, y_offset: 0, pixel_format: BayerRG8, image_size: 6410688 }

payload received! block_id: 9, timestamp: 285321.3222372s
ImageInfo { width: 3088, height: 2076, x_offset: 0, y_offset: 0, pixel_format: BayerRG8, image_size: 6410688 }

A lot of times I correctly get the 10 frames, once I got 10 DataDiscarded errors, sometimes first 2-4 frames error.

This is with /sys/module/usbcore/parameters/usbfs_memory_mb set to 1000 (1 GB).