you can use the new ETW tracing facilities for USB to see what is happening
in win7
d
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"suresh" <> wrote in message
news:2271bd0d-a08f-4525-946d-...
> Hi,
>
> We have a usb based Ethernet adapter. It is a high speed (2.0) device.
> The throughput observed on Win7 is around 30 Mbps lower than that
> observed on Windows XP!
> Both drivers are certified. There is not much difference between these
> drivers except NDIS5-NDIS6 and WDM-WDF related changes. Even the same
> NDIS5-WDM driver used on XP gives lower throughput figures on Win7.
>
> When checking the receive side operations we noticed that the
> difference between 2 consecutive Read completions on XP is around
> 30-50 microseconds, while the same on Win7 is around 200 microseconds.
> We are using Continuous Reader with default (NumPendingReads = 0)
> value. The observations didn't change when using different (upto 10)
> values, or using manual polling based reading.
>
> Since the traffic generator on the other side is same in both cases,
> the Win7 is also expected to receive those packets as fast as XP.
> Is this an expected behavior or I am missing something here?
> Thanks,
>
> Regards,
> Suresh
>
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