03-14-2009
hdparm + Inappropriate ioctl for device
Hi All,
Am finding performance of my SD card using hdparm.
Code:
hdparm -tT /dev/BlockDev0
/dev/BlockDev0:
Timing cached reads: 1118 MB in 2.00 seconds = 558.61 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
Timing buffered disk reads: 14 MB in 3.13 seconds = 4.47 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
Am not aware of "HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate ioctl for device". What actually makes it to occur?? What does this problem mean? How to resolve it??
Thanks in advance.
Amio
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flush(3tcl) Tcl Built-In Commands flush(3tcl)
__________________________________________________________________________________________________________________________________________________
NAME
flush - Flush buffered output for a channel
SYNOPSIS
flush channelId
_________________________________________________________________
DESCRIPTION
Flushes any output that has been buffered for channelId.
ChannelId must be an identifier for an open channel such as a Tcl standard channel (stdout or stderr), the return value from an invocation
of open or socket, or the result of a channel creation command provided by a Tcl extension. The channel must have been opened for writing.
If the channel is in blocking mode the command does not return until all the buffered output has been flushed to the channel. If the chan-
nel is in nonblocking mode, the command may return before all buffered output has been flushed; the remainder will be flushed in the back-
ground as fast as the underlying file or device is able to absorb it.
EXAMPLE
Prompt for the user to type some information in on the console:
puts -nonewline "Please type your name: "
flush stdout
gets stdin name
puts "Hello there, $name!"
SEE ALSO
file(3tcl), open(3tcl), socket(3tcl), Tcl_StandardChannels(3tcl)
KEYWORDS
blocking, buffer, channel, flush, nonblocking, output
Tcl 7.5 flush(3tcl)