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Re: Performance of encrypted filesystem

[Catching up on a d-u backlog:]

On Sun, 16 Aug 2009 12:03:25 +0300
Γιώργος Πάλλας <gpall@ccf.auth.gr> wrote:

> Teemu Likonen wrote:
> > On 2009-08-12 09:38 (+0300), Teemu Likonen wrote:
> >
> >   
> >> Do you (or anybody) have numbers or educated guesses on how much it
> >> slows down the disk operation or how it will affect CPU load?
> >>     
> >
> > I found such an article and it seems to indicate that LUKS system has no
> > much performance penalty on disk IO.
> >
> > http://www.tomshardware.com/reviews/locking-linux-creating-a-cryptobook,1303.html
> >
> >
> >   
> This has been discussed numerous times on this list. Most people using
> it (me also) report that there is no observed performance impact...

I recently reinstalled Debian Sid on my laptop, both to remove cruft
and to move to full disk encryption (similar to Manoj's setup -
everything except /boot on lv's on top of a luks encrypted partition).
The system on the whole seems leaner and snappier, but one major
performance hit that I seem to notice is that suspending to disk is
*much* slower.  I don't have actual numbers or proper benchmarks, but I
have the impression that it's something like half as fast, or even
slower.  I don't know for sure that this is related to the encryption;
I suppose that there may have been some other critical change, or it
may even be subjective, and all or partly in my head ...

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