Mike Tancsa wrote:
At 03:52 PM 13/08/2006, Marc van Woerkom wrote:
Maybe someone here can give a comment?
But writing speed seems slow to me, I measure about 56 to 64 kbyte/s
transfer
rate only:
tty ad0 da2 cpu
tin tout KB/t xfrs MB KB/t xfrs MB us ni sy in id
2 110 16.00 1 0.02 8.00 7 0.05 19 0 4 2 75
9 209 16.00 1 0.02 8.00 7 0.05 17 0 2 1 80
8 94 8.00 1 0.01 8.00 7 0.05 19 0 2 1 78
12 110 40.00 2 0.08 8.00 8 0.06 28 0 2 2 68
That seems pretty slow. I get about 2.7MB/s on writes. How are you
writing to it?
port 5 addr 2: high speed, power 250 mA, config 1, Mass Storage
Device(0x6362), Generic(0x058f), rev 1.10
This is against 50x CF
% iostat -c 1000 da1
tty da1 cpu
tin tout KB/t tps MB/s us ni sy in id
0 1 61.19 0 0.01 0 0 0 0 100
0 130 64.00 42 2.62 0 0 0 0 100
0 44 64.00 43 2.68 0 0 2 0 98
0 43 64.00 42 2.62 0 0 3 0 97
0 43 64.00 43 2.68 1 0 1 0 98
0 43 64.00 41 2.56 0 0 4 0 96
# dd if=/usr/obj/nanobsd.sentex/_.disk.full of=/dev/da1 obs=64k
1007616+0 records in
7872+0 records out
515899392 bytes transferred in 185.655989 secs (2778792 bytes/sec)
---Mike
Hah, now it gets interesting! :-)
When I write in your fashion, I get similiar results:
[EMAIL PROTECTED] /]# dd if=/dev/zero of=/dev/da2 obs=64k
dd: /dev/da2: end of device
967808+0 records in
7560+0 records out
495452160 bytes transferred in 237.168706 secs (2089028 bytes/sec)
To be more precise:
In my case the first couple of seconds nothing at all happened, the transfer
rate was 0 MB/s! No idea why, perhaps some cache effect?
Then the 2.87 MB/s rates kick in. Which is about the reading speed,
I measured originally.
tin tout KB/t tps MB/s us ni sy in id
0 88 0.00 0 0.00 9 0 10 5 75
0 163 0.00 0 0.00 5 0 9 5 80
0 140 0.00 0 0.00 9 0 20 6 64
368 84 0.00 0 0.00 9 0 5 4 83
88 100 0.00 0 0.00 2 0 8 2 89
128 72 0.00 0 0.00 3 0 8 2 88
200 242 64.00 8 0.50 7 0 12 4 77
224 75 64.00 38 2.37 26 0 12 5 56
0 107 64.00 46 2.87 13 0 7 5 74
184 81 64.00 45 2.81 29 0 6 4 61
224 93 64.00 46 2.87 8 0 5 3 84
120 79 64.00 46 2.87 9 0 5 2 84
0 147 64.00 45 2.81 6 0 12 1 81
0 91 64.00 46 2.87 6 0 2 2 91
0 89 64.00 45 2.81 3 0 5 2 90
0 91 64.00 46 2.87 4 0 4 5 88
0 98 64.00 46 2.87 3 0 5 3 89
0 83 64.00 45 2.81 7 0 5 5 82
0 106 64.00 46 2.87 8 0 6 5 81
0 100 64.00 45 2.81 7 0 7 2 84
Your question, how I wrote it, was a good one.
Instead of using a USB stick to do quick transfers from my notebook (not
everywhere I have
a WLAN base station, or ethernet cable available to connect to) I
intended to use the
cardreader+SD card as an USB stick replacement.
E.g. my wife has a PC with a HP inkjet printer, where the printer has
its own handy SD
card slot - ready to quickly print photos from SD cards (from digital
cameras) without
needing the PC to be powered on. It is easier to put a SD card in the
front slot of the printer
than to fiddle an USB stick into the PCs USB connector at the back side
of its case.
Usually I put the SD card in the digicam and it gets formated with a FAT
system.
The SD card I used here, the one with slow write transfer rates, however
was formatted by me.
Originially I used did a
newfs_msdos /dev/da2
to format the media as FAT disk..
On the notebook this is ok. I was able to mount it and read/write the card.
However when I put that one in the HP's card reader slot, its LED turned
red instead green and the PC's Windows 2000 compained about a
card failure but then allowed me to see the SD card's contents.
While it worked the red LED buggered me.
After a while I realized that the SD card just got a FAT system,
but was lacking a partioning / slicing. Ouch. :-)
So then I used sysinstall and created a FAT partion on the SD card.
And then I ran
newfs_msdos /dev/da2s1
to format it.
This made the printer happy (green light) and Windows didn't
feature an error message anymore.
Thus we have this result so far:
- direct writing of the card (dd to /dev/da2) gives full speed transfer
rates (2.81 MB/s)
- writing to the card, which has a FAT partition (created with
sysinstall and newfs_msdos),
via /dev/da2s1 gives slow transfer rates (56-64 kB/s)
I used the cp command, transfering some podcast mp3 files to the SD card
Now I have to find out who is the culprit.
The formatting? (Because it is formatted at all? Is there a difference
if I partion and format
the SD card through Windows XP instead of the above FreeBSD command?)
- The cp command?
Regards,
Marc
_______________________________________________
[email protected] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-usb
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
