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Re: unscientific eMMC read speed test

 

On Mon, Sep 26, 2011 at 19:35, Jani Monoses <jani.monoses@xxxxxxxxx> wrote:
> On Mon, Sep 26, 2011 at 3:00 PM, Jani Monoses <jani.monoses@xxxxxxxxx>
> wrote:
>>
>> 10Z model with kernel built from current git (not a deb package install)
>> and no modules loaded.
>> 4294967296 bytes (4.3 GB) copied, 160.107 s, 26.8 MB/s
>> 0.02user 24.74system 2:40.12elapsed 15%CPU
>> I need to see why I have worse numbers with the .deb
>
> So if I boot with a kernel and modules moved out of the /lib/modules path so
> it cannot find them on boot,
> the speed is 26/27 MB/s
> If I boot same kernel and allow modules to load (37 of them) the speed is
> 16/17 MB/s .
> Loading in all those modules in a kernel that started without them does not
> affect the performance, it remains at 26Mb
> Loading them at boot seems to have an effect on how the system behaves
> later.
> Jani
leon@ssd:~$ sudo dd if=/dev/mmcblk0 of=/dev/null bs=4M count=1024
1024+0 records in
1024+0 records out
4294967296 bytes (4.3 GB) copied, 264.54 s, 16.2 MB/s
leon@ssd:~$ uname -a
Linux ssd 2.6.38.3+ #29 SMP PREEMPT Sat Sep 24 13:54:54 IDT 2011 armv7l armv7l
armv7l GNU/Linux

Kernel based on latest commit cbc11bee6315a98c65dd18e4b1b8559328a468e2
With modules loaded at the boot.

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-- 
Leon Romanovsky | Independent Linux Consultant
        www.leon.nu | leon@xxxxxxx


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