PCMCIA and CF Slot speeds

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david_halliday
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PCMCIA and CF Slot speeds

Post by david_halliday »

Last night I did some speed tests on the CF card slot and PCMCIA card slot. Here is what I did

Inset a PNY Ultra DMA 4GB card into CF slot

dd 1GB of data from /dev/zero to the card and time it
dd 1GB file just created to /dev/null and time it

Repeat the above with a generic 2GB (microcenter) card

Repeat both the above using the PCMCIA slot (via a trancend pcmcia to CF converter)

All measurements came out at about 1.6 MB/s (mega bytes per second)

Not exactly fast.

Dave.
volkswagner
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Re: PCMCIA and CF Slot speeds

Post by volkswagner »

I figure this would be the best place to add my hdparm results.  I recall a request on drive speeds.  Here are my results.  Please note hdparm is not a real world test, but good information can be gathered.

**********NOTE***********
This is on a modified system.  I have sym links for /home, /usr/bin, /usr/lib, and /usr/local which were all moved to the CF disk.  This on top of XFCE4 loaded on quotaholics IceWM image of Debian Lenny.  I will try this on a less modified install to see if results differ.
**************************

Hard disk tests internal=hda vs. Compact Flash=hdc


Internal hda

webdt@WebDT366:/hdc7/Debian5-LXDE-WebDT366-1.0$ sudo hdparm -Tt /dev/hda
/dev/hda:
Timing cached reads:    62 MB in  2.01 seconds =  30.91 MB/sec
Timing buffered disk reads:    6 MB in  4.37 seconds =  1.37 MB/sec

webdt@WebDT366:/hdc7/Debian5-LXDE-WebDT366-1.0$ sudo hdparm -Tt /dev/hda1
/dev/hda1:
Timing cached reads:    64 MB in  2.00 seconds =  31.92 MB/sec
Timing buffered disk reads:    6 MB in  4.31 seconds =  1.39 MB/sec


Compact Flash hdc 4GB Transcend X266

webdt@WebDT366:/hdc7/Debian5-LXDE-WebDT366-1.0$ sudo hdparm -Tt /dev/hdc
/dev/hdc:
Timing cached reads:    52 MB in  2.00 seconds =  26.00 MB/sec
Timing buffered disk reads:    4 MB in  3.12 seconds =  1.28 MB/sec

webdt@WebDT366:/hdc7/Debian5-LXDE-WebDT366-1.0$ sudo hdparm -Tt /dev/hdc7
/dev/hdc7:
Timing cached reads:    52 MB in  2.00 seconds =  25.96 MB/sec
Timing buffered disk reads:    4 MB in  3.08 seconds =  1.30 MB/sec

webdt@WebDT366:/hdc7/Debian5-LXDE-WebDT366-1.0$ sudo hdparm -Tt /dev/hdc5
/dev/hdc5:
Timing cached reads:    50 MB in  2.00 seconds =  24.95 MB/sec
Timing buffered disk reads:    4 MB in  3.11 seconds =  1.29 MB/sec
Last edited by volkswagner on Mon May 11, 2009 5:06 pm, edited 1 time in total.
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