Re: [Discuss-gnuradio] Try to improve E100's performance at high sample rate

[ziyang]

On 01/16/2012 05:51 PM, Philip Balister wrote:
> On 01/13/2012 12:19 PM, ziyang wrote:
> > BTW, it took almost twice the amount of time to build both uhd and GNU
> > radio after burning the latest console file system, and the
> > initialization process of uhd (when device information is printed out)
> > took a lot longer time than before as well. But what I concerned more is
> > that much fewer packets could be received, compared with another e100
> > which has the same flow graph setup but installed previous versions of
> > tools: file system, UHD_003.004.000-1a25e48, GNU radio 3.5.0. Could it
> > be caused by some hardware problems? I will greatly appreciate it if
> > someone could give me a hint on this.
> Assuming you downloaded u-boot from dropbox, we just found a regression
> that slipped into u-boot on Dec 6. I have updated the version in the
> dropbox to:
>
> http://dl.dropbox.com/u/14618236/u-boot-usrp-e1xx-2011.12-r1.bin
>
> All you need to do is copy u-boot onto the FAT partition and things
> should speed up quite a bit.
>
> This makes sure L2 cache is on before Linux boots. There is some
> discussion of how to properly turn it on at boot in Linux at the moment.
>
> This does not effect the factory file system.
>
> Thanks for reporting this!
>
> Philip

Previously, I got the console image from here:
http://ettus-apps.sourcerepo.com/redmine/ettus/projects/usrpe1xx/wiki/Images

and 2011.12 version of u-boot.

Now, I change the u-boot to that updated version, now the initialization time 
of uhd is normal. And after booting up e100, the time for ethernet connection 
is normal as well, previously, ethernet will be disconnected for a couple of 
seconds.

Thank you for your help!

Best Regards,

Terry