emX (intel) interface ring parameters

[Wojciech Puchar]

man em

      hw.em.rxd
              Number of receive descriptors allocated by the driver.  The
              default value is 256.  The 82542 and 82543-based adapters can
              handle up to 256 descriptors, while others can have up to 
4096.

      hw.em.txd
              Number of transmit descriptors allocated by the driver.  The
              default value is 256.  The 82542 and 82543-based adapters can
              handle up to 256 descriptors, while others can have up to 
4096.



and other things.

BTW i'm getting excellent performance from such card (PCIe, 1000Mbps/s) 
with minimal CPU load

On Tue, 9 Jun 2009, Martin Badie wrote:

> Hi,
>
> On linux I can change ring parameters like:
>
> /sbin/ethtool -G eth1 rx 4096
>
>       -G --set-ring
>              change the rx/tx ring parameters of the specified ethernet device.
>
> how can I do that in FreeBSD so I can get a better performance from my interface
>
> Regards.
>
>
>
>
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