Re: Best NIC for FBSD (was: Buffer Problems and hangs in 4.0-CURRENT..)

[Ian Dowse]

In message <[EMAIL PROTECTED]>, Mike Smith writes:
>> fxp0:  The Intel driver is by far the highest preformance model,
>> beats the 3com (second best) hands down with much lower CPU 
>> overhead.
>
>Do you actually have any numbers to quantify this?  There's nothing in 
>the driver architecture nor any of my testing that would suggest this is 
>actually the case at this point.

The FreeBSD fxp driver does a lot to reduce the number of transmit
interrupts; only 1/120 of transmitted packets result in interrupts. See
the code relating to FXP_CXINT_THRESH.

Assuming an even balance of transmitted and received packets, this should
reduce the total number of interrupts by nearly 50%. I don't know if
drivers for other cards do (or even can) use this approach.

Ian


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