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[Mirror] Some kind of OS: git://git.9front.org/plan9front/plan9front
fc859af624
the symptom is that ping is apparently skipping transmits which recover with the next send, resulting in exactly send-period spikes in the ping rtt. It appears that the core seems to reorder writes to uncached memory, which can result in the doorbell being written before the descriptor status bits are written. put a coherence() barrier before writing doorbell fixes it. thanks sigrid for reporting the issue! |
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