Beagleboard SD read speed

[Koen Kooi]

Hi,

I was looking at SD read speed today and got this result:

root@beagleboard:~# hdparm -t /dev/mmcblk0

/dev/mmcblk0:
Timing buffered disk reads: 44 MB in 3.02 seconds = 14.59 MB/sec

That used to be only 5MB/s

The patch that gave the boost was:

http://sakoman.net/cgi-bin/gitweb.cgi?p=linux-omap-2.6.git;a=commitdiff;h=6c4d34031c80ca4b50ffe73a4ef7fe197a760a60

regards,

Koen

[Prabu]

Whats the make/capacity of the SD card you are using ?

On Jul 24, 12:55 pm, Koen Kooi <koen.k...@gmail.com> wrote:
> Hi,
>
> I was looking at SD read speed today and got this result:
>
> root@beagleboard:~# hdparm -t /dev/mmcblk0
>
> /dev/mmcblk0:
>  Timing buffered disk reads:   44 MB in  3.02 seconds =  14.59 MB/sec
>
> That used to be only 5MB/s
>
> The patch that gave the boost was:
>

> http://sakoman.net/cgi-bin/gitweb.cgi?p=linux-omap-2.6.git;a=commitdi...
>
> regards,
>
> Koen

[Frantisek Dufka]

Koen Kooi wrote:
> Hi,
>
> I was looking at SD read speed today and got this result:
>
> root@beagleboard:~# hdparm -t /dev/mmcblk0
>
> /dev/mmcblk0:
> Timing buffered disk reads: 44 MB in 3.02 seconds = 14.59 MB/sec

Very nice. You can do ~12MB/s on N810 in same mode. I wonder if 8 bit
mmc mode could make that faster on Beagle or if those 14.5MB are limited
by current omap3 clock speed and kernel mmc stack (since even 4 bit over
48MHz should do better in theory).

Frantisek

[Koen Kooi]

On 26 jul, 04:26, Prabu <prabi...@yahoo.com> wrote:
> Whats the make/capacity of the SD card you are using ?

sandisk 4GB UltraII sdhc.