Re: [Discuss-gnuradio] USRP Delay Measurements

2006-11-09 Thread Thomas Schmid
Hi Eric, I did some calculations and something doesn't add up. As I mentioned in my last email, I am using usrp.sink_s. Thus, my samples are real shorts (16 bit). I verified the buffer size by printing out the buffer allocation size in gnuradio-core/src/lib/runtime/gr_buffer.cc. The size is 32KB.

Re: [Discuss-gnuradio] USRP Delay Measurements

2006-11-09 Thread Thomas Schmid
On 11/8/06, Eric Blossom <[EMAIL PROTECTED]> wrote: On Wed, Nov 08, 2006 at 03:14:01PM -0800, Thomas Schmid wrote: > I set the fusb buffering for the square wave test, additional to > setting real time scheduling. The result is similar. For different > decimation factors I get delays. What I didn

Re: [Discuss-gnuradio] USRP Delay Measurements

2006-11-08 Thread Eric Blossom
On Wed, Nov 08, 2006 at 03:14:01PM -0800, Thomas Schmid wrote: > On 11/8/06, Eric Blossom <[EMAIL PROTECTED]> wrote: > > >Have you tried explicity setting the fast usb buffering? > >Take a look at the examples in gnuradio-examples/python/digital/*.py > > I set the fusb buffering for the square wav

Re: [Discuss-gnuradio] USRP Delay Measurements

2006-11-08 Thread Thomas Schmid
On 11/8/06, Eric Blossom <[EMAIL PROTECTED]> wrote: On Wed, Nov 08, 2006 at 02:06:11PM -0800, Thomas Schmid wrote: > Hi all, > > I am currently trying to measure delays on the USRP and found some > interesting things. I wanted to see if others have similar results: > > - First I measured the roun

Re: [Discuss-gnuradio] USRP Delay Measurements

2006-11-08 Thread Eric Blossom
On Wed, Nov 08, 2006 at 02:06:11PM -0800, Thomas Schmid wrote: > Hi all, > > I am currently trying to measure delays on the USRP and found some > interesting things. I wanted to see if others have similar results: > > - First I measured the round trip time of my IEEE 802.15.4 > implementation. I

[Discuss-gnuradio] USRP Delay Measurements

2006-11-08 Thread Thomas Schmid
Hi all, I am currently trying to measure delays on the USRP and found some interesting things. I wanted to see if others have similar results: - First I measured the round trip time of my IEEE 802.15.4 implementation. I have to computers, one runs a ping application, the other one a pong. The av