problem in Network device driver.

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Hello list,

I have written a network device driver, and to validate it, I am
running a bandwidth measurement tool on it,
I am encountering a strange drop in bandwidth when data size reaches
to 4096, bandwidth figures drop form 24 Mbps (for 2k data size)
to .43 Mbps. what can be the problem, the MTU of my device is 2044. Is
it some how related to functioning of hard_start_xmit?

Thanks in advance
Devesh

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