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Special Forums Hardware Filesystems, Disks and Memory SD Card Throughput exceeds - On using "dd" command Post 302294466 by amio on Thursday 5th of March 2009 09:08:25 AM
Old 03-05-2009
SD Card Throughput exceeds - On using "dd" command

Hi All,
Am using dd command to find throughput of my Normal speed SD card.
After mounting the sd card, i run,

Code:
time dd if=/dev/zero of=/mnt/sdcard/Myfile.txt bs=512
count=20480;umount /mnt/sdcard;
20480+0 records in
20480+0 records out
10485760 bytes (10 MB) copied, 0.0658825 s, 159 MB/s

real    0m0.097s
user    0m0.013s
sys     0m0.055s

But the throughput shown(159 MB/s) exceeds the normal speed of SD specification (25MB/sec).

Could you please comment on this??

Thanks,
Amio
 

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csx_Parse_CISTPL_MANFID(9F)				   Kernel Functions for Drivers 			       csx_Parse_CISTPL_MANFID(9F)

NAME
csx_Parse_CISTPL_MANFID - parse Manufacturer Identification tuple SYNOPSIS
#include <sys/pccard.h> int32_t csx_Parse_CISTPL_MANFID(client_handle_t ch, tuple_t *tu, cistpl_manfid_t *cm); INTERFACE LEVEL
Solaris DDI Specific (Solaris DDI) PARAMETERS
ch Client handle returned from csx_RegisterClient(9F). tu Pointer to a tuple_t structure (see tuple(9S)) returned by a call to csx_GetFirstTuple(9F) or csx_GetNextTuple(9F). cm Pointer to a cistpl_manfid_t structure which contains the parsed CISTPL_MANFID tuple information upon return from this function. DESCRIPTION
This function parses the Manufacturer Identification tuple, CISTPL_MANFID, into a form usable by PC Card drivers. The CISTPL_MANFID tuple is used to describe the information about the manufacturer of a PC Card. There are two types of information, the PC Card's manufacturer and a manufacturer card number. STRUCTURE MEMBERS
The structure members of cistpl_manfid_t are: uint32_t manf; /* PCMCIA assigned manufacturer code */ uint32_t card; /* manufacturer information (part number and/or revision) */ RETURN VALUES
CS_SUCCESS Successful operation. CS_BAD_HANDLE Client handle is invalid. CS_UNKNOWN_TUPLE Parser does not know how to parse tuple. CS_NO_CARD No PC Card in socket. CS_NO_CIS No Card Information Structure (CIS) on PC card. CS_UNSUPPORTED_FUNCTION No PCMCIA hardware installed. CONTEXT
This function may be called from user or kernel context. SEE ALSO
csx_GetFirstTuple(9F), csx_GetTupleData(9F), csx_RegisterClient(9F), csx_ValidateCIS(9F), tuple(9S) PC Card 95 Standard, PCMCIA/JEIDA SunOS 5.10 20 Dec 1996 csx_Parse_CISTPL_MANFID(9F)
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