Printing over a network stalls (regression)

[vidrep]

Printer - Epson NX625

Driver - Gutenprint

Protocol - LPR/HP JetDirect

Printing the Haiku test page over a network will stall about 2/3 of the way through the job, and freeze print_server. Alpha 4.1 works. Beta 1 and later do not work.

[vidrep]

After spending 2 days and lots of ink tracking the regression down, I can confirm that hrev51385 is the commit that broke network printing.

[vidrep]

Attached are tcpdump outputs from hrev51382 and current for comparison.

[pulkomandy]

Hi, The issue is easy to see in the pcap. In both cases, we can see that the printer TCP window reaches a size of 0 (meaning the buffer in the printer is full and it cannot accept more packets). On the hrev51382 capture, the computer sends a "zero window probe" after some delay, and does this until the printer sends a "TCP window update" once it has enough space again in its internal buffer. In the new capture, there is no zero window probe, and when the printer sends a window update, the transfer does not resume, and the TCP communication just stops there.

[korli]

Could you check again with hrev55087? Thanks

[vidrep]

Tested with hrev55087 x86x-64. Working again with LPR and HP JetDirect. Closing.

[korli]

Thanks for the feedback.