Date: Sun, 13 Aug 2006 17:17:23 -0400 From: Mike Tancsa <mike@sentex.net> To: Marc van Woerkom <marc.vanwoerkom@FernUni-Hagen.de>, freebsd-usb@freebsd.org Subject: Re: [Fwd: SD card speed] Message-ID: <6.2.3.4.0.20060813170759.12be7730@64.7.153.2> In-Reply-To: <44DF8308.9080700@fernuni-hagen.de> References: <44DF8308.9080700@fernuni-hagen.de>
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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
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