On (11/30/16 17:25), Shannon Nelson wrote: > I've recently been studying up on the sparc LDom environment and > sunvnet, the virtual network device. In looking through the code I > ran across an odd bit of tx control that I don't quite understand. : > In order to get into the if-block there needs to be a 0 or negative > return from vnet_tx_dring_avail(), yet then we're checking it again, > with no discernible delay, for a positive value. I don't see how we > could get to the netif_tx_wake_queue() call - shouldn't there be > some delay, or perhaps something that might bump the underlying > channel before checking for more available space? > > Perhaps I've missed something? And fwiw, Shannon asked me this question, and I too did not have the history here. Perhaps DaveM remembers where this came from? --Sowmini -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
