Bridging the Gap between Software and Hardware Techniques for I/O Virtualization


 
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Old 06-23-2008
Bridging the Gap between Software and Hardware Techniques for I/O Virtualization

HPL-2008-39 Bridging the Gap between Software and Hardware Techniques for I/O Virtualization - Santos, Jose Renato; Turner, Yoshio; Janakiraman, G.; Pratt, Ian
Keyword(s): Virtualization, Networking, Operating System, I/O, Performance Analysis, Xen
Abstract: The paravirtualized I/O driver domain model, used in Xen, provides several advantages including device driver isolation in a safe execution environment, support for guest VM transparent services including live migration, and hardware independence for guests. However, these advantages currently come ...
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COMEDI_GET_HARDWARE_(3) 					 Comedi reference					   COMEDI_GET_HARDWARE_(3)

NAME
comedi_get_hardware_buffer_size - get size of subdevice's hardware buffer SYNOPSIS
#include <comedilib.h> int comedi_get_hardware_buffer_size(comedi_t *device, unsigned int subdevice, enum comedi_io_direction direction); DESCRIPTION
This function returns the number of bytes the subdevice can hold in it's hardware buffer. The term "hardware buffer" refers to any FIFOs, etc. on the acquisition board itself which are used during streaming commands. This does not include the buffer maintained by the comedi kernel module in host memory, whose size may be queried by comedi_get_buffer_size. The direction parameter of type enum comedi_io_direction should be set to COMEDI_INPUT to query the input buffer size (e.g., the buffer of an analog input subdevice), or COMEDI_OUTPUT to query the output buffer size (e.g., the buffer of an analog output). RETURN VALUE
Hardware buffer size in bytes, or -1 on error. AUTHORS
David Schleef <ds@schleef.org> Author. Frank Mori Hess <fmhess@users.sourceforge.net> Author. Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be> Author. Bernd Porr <tech@linux-usb-daq.co.uk> Author. Ian Abbott <abbotti@mev.co.uk> Author. COPYRIGHT
Copyright (C) 1998-2003 David Schleef Copyright (C) 2001-2003, 2005, 2008 Frank Mori Hess Copyright (C) 2002-2003 Herman Bruyninckx Copyright (C) 2012 Bernd Porr Copyright (C) 2012 Ian Abbott This document is part of Comedilib. In the context of this document, the term "source code" as defined by the license is interpreted as the XML source. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, version 2.1 of the License. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. Comedi 07/06/2012 COMEDI_GET_HARDWARE_(3)