SanDisk micro SDHC 8GB card under testing
Mike Montour
mail at mmontour.net
Sat Jul 12 05:58:41 CEST 2008
ian douglas wrote:
> ian douglas wrote:
> Mike, your binary is 420kb ... I'm guessing that you compiled your code
> with the cross-compiler toolchain?
Probably, but it was a while ago and I don't remember where I built it
(I have a MokoMakefile cross-compile environment and a native toolchain
on the Neo). Anyway, a natively-compiled version should be fine.
> I moved the iospeed files to /opt/ so I could compare against the 512MB
> card that shipped with the Freerunner, and ran Mike's utility three
> times on the 8GB SDHC card:
>
[...]
> root at om-gta02:/media/card# /opt/iospeed2 testfile 100
> Size (MiB) Write (MiB/s) Read (MiB/s)
> 100 1.557 9.396
>
> and once on the unit's own Flash ROM as a comparison:
> root at om-gta02:/media/card# cd /opt
> root at om-gta02:/var/volatile/opt# /opt/iospeed2 testfile 50
> Size (MiB) Write (MiB/s) Read (MiB/s)
> 50 1.577 9.530
Those numbers are very similar, and given the numbers that you posted in
your later email I would guess that the 8G card was not actually mounted
for this test run.
> Then tested /tmp which I guess is a RAM drive considering the speed boost:
>
> root at om-gta02:/media/card# cd /tmp
> root at om-gta02:/var/volatile/tmp# /opt/iospeed2 testfile 50
> Size (MiB) Write (MiB/s) Read (MiB/s)
> 50 28.617 42.786
Yes, /var/volatile is a 'tmpfs' filesystem.
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