[vbox-dev] very slow installing windows 7 sp1 beta refresh

[Frank Mehnert]

On Monday 13 September 2010, walt wrote:
> On 09/13/2010 05:49 AM, Frank Mehnert wrote:
> > On Sunday 12 September 2010, walt wrote:
> >> I'm using the latest OSE.svn, and I'm seeing Windows 7 guests running at
> >> one-third the usual speed (linux host).
> >
> > We also had a check of the time which is used for a Windows 7
> > installation and were not able to observe any differences between 3.2.8
> > and current trunk. We tested this on an Intel Xeon E5345 (2 x 4 cores) on
> > Windows Server 2008.
>
> I found the guilty commit:
>
> ------------------------------------------------------------------------
> r32410 | vboxsync | 2010-09-10 07:19:33 -0700 (Fri, 10 Sep 2010) | 2 lines
>
> Got rid of unnecessary dirty page flush in InvalidatePage. (NOTE: high risk
> change)
> ------------------------------------------------------------------------
>
> I guess this must be a different problem than the one Huihong Luo reported
> because this is a very recent commit.
>
> The difference is actually more like four times slower: 64-bit Windows7 on
> 64-bit linux host normally takes 27 seconds from power-on to login prompt,
> but after this commit it takes 74 seconds.  Not negligible.
>
> I don't have any Windows hosts I can test -- I don't need a Windows machine
> any longer thanks to you guys :)

Thanks for this information! Does your host have an Intel CPU or an AMD CPU?

Kind regards,

Frank
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