Re: [Discuss-gnuradio] fusb_nblock and fusb_block_size

[Eric Blossom]

On Thu, Nov 30, 2006 at 01:29:16PM -0500, Greg Troxel wrote:
> 
>   fusb_block_size is the size in bytes of the maximum transfer that we
>   will ask the kernel to make to/from user-space.  fusb_nblocks is the
>   maximum number of transfers (of maximum size fusb_block_size) that we
>   can have in flight at any given time.
> 
> I think this is Linux-specific.  The NetSBD USB implementation takes
> the numbers and pushes them into the kernel where I think there is
> similar treatment (total size of read-ahead buffer, and size of IO
> request made to USB subsystem).
> 
> We'll need to come up with a clean OS/HW independent way of dealing
> with block sizes and controlling latency, along with enabling code to
> end up at the lowest latency mode that works without hand tuning.

Yep ;)

Eric