I've noticed that no matter how small of a time out value I specify, it
always takes at least two seconds and sometimes 3 seconds for a
ControlRequestTO call from user space on pipeRef 0.
Also interesting, is that it seems to be exactly 2 seconds or exactly 3
seconds.
If I use the default, or increase my time out to something great than 2
seconds, I get the expected longer timeout, so I think my code is
behaving correctly.
Is there anything I can do to make these timeouts happen quicker?
Here are some examples from USB Prober where multiple requests are
being made immediately after each other:
177.481 [1] +AppleUSBOHCI[0x20e0000]::ReturnOneTransaction(0x9fac828,
0x20ecb80, e0004051)
179.481 [1] +AppleUSBOHCI[0x20e0000]::ReturnOneTransaction(0x9fac7bc,
0x20ecb80, e0004051)
181.481 [1] +AppleUSBOHCI[0x20e0000]::ReturnOneTransaction(0x9fac750,
0x20ecb80, e0004051)
183.481 [1] +AppleUSBOHCI[0x20e0000]::ReturnOneTransaction(0x9fac6e4,
0x20ecb80, e0004051)
185.481 [1] +AppleUSBOHCI[0x20e0000]::ReturnOneTransaction(0x9fac678,
0x20ecb80, e0004051)
Let me know if there is any additional information I can provide to
help with this,
Dave Koziol
VP of Engineering
IOXperts, Inc.
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