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Re: [Discuss-gnuradio] Hard Disk Bottleneck
From: |
Martin Dvh |
Subject: |
Re: [Discuss-gnuradio] Hard Disk Bottleneck |
Date: |
Sun, 11 Feb 2007 14:19:11 +0100 |
User-agent: |
Debian Thunderbird 1.0.2 (X11/20070113) |
Vincenzo Pellegrini wrote:
> Hi everybody,
>
> just a quick question: has anybody managed so far to provide the usrp
> with the 8 Complex Msps needed to transmit an 8 MHz wide band?
>
> My problem is that such a bandwidth yields a 32MiBps throughput and,
> even if the USB2 bus and the CPU speed of my machine are all right with
> this, it looks like my IDE HARD DISK cannot provide such a data rate.
>
> Can anyone please confirm whether he's been successful in something
> similar, and, if so, with what kind of HD?
>
> thanks
>
> vincenzo
If I have to read/send signals I can't process in realtime I allways do one of
the following.
Small files: use a ramdisk
Big files: use a dedicated partition at the very start of the drive,
formatted with a fast filesystem (non-journalling) with nothing
further on it.
I have a 2.5 GB fat32 partition at the start of my drive (/dev/hda1).
For RX this can just keep up with 32 MiB/sec.
For TX I never have been able to get more then 16 MiB/sec, even when using a
ramdisk or using a null_source.
I don't know why there is a difference between TX and RX. Maybe there is a
subtle buffering, timing or other difference in the communication
with the usrp.
Has anobody else have been able to do more then 16 MiB/sec on the TX side?
Greetings,
Martin
>
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