Comment 5 for bug 709245
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| warmcat (andy-warmcat) wrote Re: panda: USB disk IO slow | #5 |
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0e1f616
(Get the code!)
I meddled around with this last week via the Fedora ARM list, it was simple to reproduce that pinging the Panda Ethernet from another machine on the local network with -i0.001 yielded an effective 50% increase in USB storage throughput at the Panda compared to it being left idle.
Neither RUNTIME_PM (suggested by Felipe Balbi at TI) nor USB_SUSPEND were to blame since the issue stayed the same with those deconfigured.
It seems the issue may be to do with the Panda's hub / ethernet chip idle / wakeup characteristics but since there are no hub registers in there settable from Panda side AFAIK (there are some settable in the missing EEPROM that can configure the hub / Ethernet bridge) I am out of ideas to follow it up.