README losetup/mount-Parameter "offset" needs another note

[Matthias Schniedermeyer <ms@xxxxxxx>]

Hi


I wanted to use a whole HDD for loop-encryption.
To prevent some types of accidents i still wanted to put a Partition-Table on the HDD with a single whole-disk-spanning partition.

So i set the offset to 512 with "/dev/sd<x>" as the backing-store.
But Performace fell to a crawl (relativly speaking) realative to a non-offseted loop.

So i increased the offset by 512 for a few times in the hope that the phaenomenom is "curable".
And with an offset of 4096 performance was the same as without an offset.

As i have a IA32-System it appears to me that the offset has to be page-aligned, in case performance matters.
So i suggest to put a note about that in the README.


-- 
Real Programmers consider "what you see is what you get" to be just as
bad a concept in Text Editors as it is in women. No, the Real Programmer
wants a "you asked for it, you got it" text editor -- complicated,
cryptic, powerful, unforgiving, dangerous.


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Linux-crypto:  cryptography in and on the Linux system
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