Re: Fwd: [Discuss-gnuradio] USRP2 eth_buffer

[Eric Blossom]

On Thu, Apr 23, 2009 at 01:15:56PM +0300, Juha Vierinen wrote:
> I have attached a patch to allow users to define the ethernet packet
> ring size. I remove the SLAB_SIZE restriction. I think gnuradio needs
> a fairly new >2.6.5 kernel anyway.
> 
> Why is this needed? I challenge anyone to sample at 25 MHz
> continuously for two hours without overruns or missing packets to a
> five disk raid array (be it ext2 or anything else) with the default 25
> MB buffer.
> 
> Still, the patch maintains the original 25e6 buffer size. A value of
> 250e6 to 500e6 allows fairly reliable sampling to disk at 25 MHz, so I
> recommend increasing the default buffer size to something higher than
> 25 MB. Otherwise new users will have problems with overruns. Even
> Firefox consumes hundreds of megabytes.
> 
> juha

Juha, thanks for the patch!

Eric