Comment 25 for bug 709245
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| Jani Monoses (jani) wrote Re: panda: USB disk IO slow | #25 |
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0e1f616
(Get the code!)
I tested some more today (Oneiric 3.0 kernel) and the external USB drive on a Panda.
With nosmp passed on the boot command line, the throughput is good with or without the ping and about the same as using both cores and pinging it.
Booting with both cores and putting cpu1 offline does not seem to affect the behaviour - pinging leads to 4x or 5x throughput over not-pinging.
So it may be related to SMP scheduling. Also nosmp and putting one core offline at runtime is apparently not the same ( I naively thought it should be)