Thread: n800, SD, SDHC, and storage
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aleksandyr is offline aleksandyr
2007-05-08 , 15:28
Posts: 474 | Thanked: 30 times | Joined on Jan 2006
#39
My Connect3D 4GB non-SDHC card reads something in the 8-10MB/sec range, compared to my Kingston 2GB MMCMobile which reads in the 9-12MB/sec range.

Worth noting, I think, is that these cards are on sale again at ECost for $20. I'd be happy to post specific benchmarks and such: I'll also point at Dealram as where I keep finding cheap memory.

Write ~160MB: 65 seconds, 2.5MB/sec
Code:
Nokia-N800-10:~# s=$(date +%s) ; dd if=/dev/zero of=/media/mmc2/test bs=4096 count=40000 ; sync ; e=$(date +%s) ; echo $((e-s))
40000+0 records in
40000+0 records out
65
Read ~160MB: 17 seconds, 9.4MB/sec
Code:
Nokia-N800-10:~# s=$(date +%s) ; dd if=/dev/mmcblk1 of=/dev/null bs=4096 count=40000 ; sync ; e=$(date +%s) ; echo $((e-s))
40000+0 records in
40000+0 records out
17
Output in dmesg:
Code:
mmc1: clock 48000000Hz busmode 2 powermode 2 cs 0 Vdd 15 width 2                          timing 2
Somewhat related, today at work I plan to build a new kernel incorporating MPPE as well as the SDHC patches --- I'm also going to get a full suite of modules together for cifs, nfs, ext3, so forth, and so on. If anyone is interested, I'd be happy to post it up somewhere.

Also somewhat related, I might put together a Python script that will test your cards and upload benchmarks for you to a special site, if I'm bored enough at work