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[Discuss-gnuradio] USB writing problem

From: Harvind Samra
Subject: [Discuss-gnuradio] USB writing problem
Date: Mon, 10 Aug 2009 10:48:57 -0700

We've occasionally encountered cases, while running OpenBTS, where the
USRP code hang up and starts spitting out the following message

short write xfer: 0 != 3584

In looking at fusb_linux.cc, it looks like USB writes suddenly cease to
complete.  Sometimes, the host machine hangs so badly that a reboot is

I know USB on linux has always had problems.  So my questions are:

1) Is this problem specific to the USRP or does it have to do with
2) Is the specific to certain USB controllers?
3) Has this bug been addressed in recent updates/releases to gnuradio?

Any help is appreciated.  Thanks.

Harvind Samra
Kestrel Signal Processing, Inc.

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