NAT: SendQueue is too small

[Michael Hamer]

When the guest produces heavy network traffic, the log file shows several errors of this kind: 02:14:52.307 NAT: 64 messages suppressed about dropping package (couldn't allocate queue item)

This suggest that the size of the queue is too small for heavy traffic. The queue is currently allocated to 50 entries in line 821 of root/trunk/src/VBox/Devices/Network/DrvNAT.cpp

I'd suggest to double the size of the queue or, even better, to make it configurable.

[Frank Mehnert]

Do you get messages about dropped network packets?

[vasily Levchenko]

Allocating too many packets and late sending will cause too many retransmissions that will dramatically decrease network throughput.