Re: [Tails-dev] Please review feature/hugetlb_mem_wipe

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Autor: anonym
Datum:  
To: The Tails public development discussion list
Betreff: Re: [Tails-dev] Please review feature/hugetlb_mem_wipe
09/10/12 16:43, intrigeri wrote:
>
>> * devel (many `sdmem` in parallel thanks to 0f1f476d):
>
>>   - With PAE kernel:
>>     * Patterns remaining after wipe: 0 (!)
>>     * Time required for wipe: 8 seconds.

>
>>   - With "normal" non-PAE kernel:
>>     * Patterns remaining after wipe: 900K ≃ 14 MiB of memory
>>     * Time required for wipe: 4 seconds.

>
> anonym, how many such tests did you run?


At least two. The 0 above was so shocking so I ran that test five times,
I think. :)

> I find it intriguing that the PAE and non-PAE results differ.


Me too. I tested this for a completely different reason: without PAE, my
Tails VM (VirtualBox) often freezes when I run many fillram in parallel
during a wipemem test. I wanted to check if similar freezes happened
when many sdmem are run in parallel. It never froze, but instead I found
this discrepancy. Lucky catch.

Cheers!