Re: [Qemu-devel] QCow v2

[Natalia Portillo]

Just there is a question:

If improvement is 5%, IS NOT THE SAME with a 5Mb HDD that with a 5Gb  
HDD.

Wanna do testing with more real scenarios?

Like a Windows XP full installation for example?

I'm very sure that there will be a real difference.

Regards

El 04/07/2006, a las 15:51, Christian MICHON escribió:

> for what it's worth:
> qcow with "lzo -9" would become 4155352 bytes (bigger than original
> zlib qcow).
>
> yet it's true at the compression and decompression stages that it
> feels faster...
>
> On 7/4/06, Elefterios Stamatogiannakis <address@hidden>  
> wrote:
> > I agree
> >
> > Lzma and zlib are pretty much equivalent, so there is pretty much
> > nothing to be gained except slightly more compression.
> >
> > On the other hand with lzo (1) there would be quite a considerable  
> > speed
> > improvement at the cost of compression.
> >
> > It could also mean that reading on the qcow format could some  
> > times be
> > faster (with compressible data) than   reading directly from the  
> > hard disk.
> >
> > lefteris
> >
> > (1) http://www.oberhumer.com/opensource/lzo/
> >
> > Johannes Schindelin wrote:
> > > Hi,
> > >
> > > On Tue, 4 Jul 2006, Christian MICHON wrote:
> > >
> > >> how about also adding lzma compression for qcow ?
> > >
> > > Why lzma? We already have a dependency on zlib, why not just  
> > take that?
> > >
> > > Ciao,
> > > Dscho
> > >
> > >
> > > _______________________________________________
> > > Qemu-devel mailing list
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> > > http://lists.nongnu.org/mailman/listinfo/qemu-devel
> >
> >
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>
>
> --
> Christian
>
>
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