Rather than treating a transient txq overrun as a network loss event schedule another call to tcp_output when the software ring has partially drained.
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@kmacy I don't think iflib is part of -head yet. I see this patch includes references to sys/net/iflib* which also don't exist in -head yet. Can this patch be applied cleanly to -head? if not, I'd be great to have that done.
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It's not part of HEAD yet. The objective here is to elucidate the mechanism. I haven't been able to test it under real load yet. Do you really want to run with scissors? :D
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I'm adding a "looks good to me" here for the Intel Reviewers as this adds functionality in the stack and the modification to the driver is required.
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Heh, as we talked on the transport call, we can reproduce this problem and would love to see how the patch is handling it. :-)
I'd let others chime-in wrt design and what not.