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Re: [Discuss-gnuradio] Losing data during long collects
From: |
Jeff Brower |
Subject: |
Re: [Discuss-gnuradio] Losing data during long collects |
Date: |
Wed, 04 Jun 2008 22:55:39 -0500 |
Chris-
> > Is there a way for you to temporarily take file-write out of the equation?
> > I.e. can
> > your code look at the bitstream and know if it remains continuous / intact?
> >
> > The "every minute or two" thing makes me suspicious that some HDD related
> > thing is
> > going on. 16 MBbyte/sec is around 1 GByte/minute.
>
> Jeff,
>
> Thanks for your recommendation. I can indeed pipe the output of my
> "data gathering app" to the input of my GPS processor and see if the
> problem goes away.
Were you able to verify that?
> However, I suspect the problem is not HDD related
> for these reasons:
>
> 1. I'm using a 4 disk RAID0 (external eSATA) drive that supposedly can
> handle the throughput
>
> 2. When I was disk bound in the past, I would receive USRP overrun
> errors. I do not receive these errors when I am presently losing a few
> thousand samples out of every 480e6
I've seen cases before where the drive does handle the throughput as
advertised, but
on an average basis. Under sustained, continuous write circumstances, when the
drive
reaches a new sector, multiple of sectors, or some other internal space
boundary,
extra time is taken for allocation... or something along those lines. That's
why I
mentioned the 1 GByte figure. It's been some time since I encountered this so
it's
just a shot in the dark (happened when working on high speed DSP based data
acquisition applications).
-Jeff
- [Discuss-gnuradio] Losing data during long collects, Chris Stankevitz, 2008/06/03
- Re: [Discuss-gnuradio] Losing data during long collects, Eric Blossom, 2008/06/03
- Re: [Discuss-gnuradio] Losing data during long collects, Jeff Brower, 2008/06/03
- Re: [Discuss-gnuradio] Losing data during long collects, Chris Stankevitz, 2008/06/03
- Re: [Discuss-gnuradio] Losing data during long collects, Chris Stankevitz, 2008/06/03
- Re: [Discuss-gnuradio] Losing data during long collects,
Jeff Brower <=
- Re: [Discuss-gnuradio] Losing data during long collects, Chris Stankevitz, 2008/06/05
- Re: [Discuss-gnuradio] Losing data during long collects, Jeff Brower, 2008/06/05
- Re: [Discuss-gnuradio] Losing data during long collects, Eric Blossom, 2008/06/05
- Re: [Discuss-gnuradio] Losing data during long collects, Chris Stankevitz, 2008/06/05
- Re: [Discuss-gnuradio] Losing data during long collects, Robert Fitzsimons, 2008/06/05
- Re: [Discuss-gnuradio] Losing data during long collects, Chris Stankevitz, 2008/06/05
- Re: [Discuss-gnuradio] Losing data during long collects, Dan Halperin, 2008/06/05
- Re: [Discuss-gnuradio] Losing data during long collects, Chris Stankevitz, 2008/06/05
- Re: [Discuss-gnuradio] Losing data during long collects, Bob McGwier, 2008/06/06
- Re: [Discuss-gnuradio] Losing data during long collects, Chris Stankevitz, 2008/06/06