[Qemu-devel] win98 slow with kqemu

[Qemu-devel] win98 slow with kqemu

[Mikhail Ramendik]

Hello,

Some time ago I reported win98 slowness with kqemu, see 
http://lists.gnu.org/archive/html/qemu-devel/2006-05/msg00295.html

I have tried again, this time on a Pentium 4 (Prescott) 3 GHz system, with 
Debian sarge and backports.org 2.6.18 kernel; qemu 0.8.2 and kqemu 1.3.0pre9 
are locally compiled, not packaged.

Still I see visible slowness with win98 guest and kqemu; it is slower than 
win98 guest without kqemu. The amnhld.vxd idlesness driver is installed.

The problem is mentioned in forums periodically, i.e. the last reply in 
http://qemu-forum.ipi.fi/viewtopic.php?t=2015 .

I would really like to have this fixed; I am somewhat experienced and will do 
what is needed for testing etc. I would try some CPU "mark" tests for a more 
objective check - but which of them will work without DirectX? 

-- 
Yours, Mikhail Ramendik

Re: [Qemu-devel] win98 slow with kqemu

[Dan Sandberg]

I have noticed the same thing.

Could it be that todays processors are simply very bad at running 16-bit 
code (that the pipeline has to be reloaded for each instruction or 
something similar)?
If this is the case there is probably nothing else to do than avoiding 
kqemu with 16-bit OS:s.

On the other hand, if for instance VMware is able to run Windows 98 much 
faster (I do not have it so I can't test this) then my guess is that 
kqemu is the guilty part and does something wrong with 16-bit code.

Regards
Dan Sandberg


Mikhail Ramendik wrote:

>Hello,
>
>Some time ago I reported win98 slowness with kqemu, see 
>http://lists.gnu.org/archive/html/qemu-devel/2006-05/msg00295.html
>
>I have tried again, this time on a Pentium 4 (Prescott) 3 GHz system, with 
>Debian sarge and backports.org 2.6.18 kernel; qemu 0.8.2 and kqemu 1.3.0pre9 
>are locally compiled, not packaged.
>
>Still I see visible slowness with win98 guest and kqemu; it is slower than 
>win98 guest without kqemu. The amnhld.vxd idlesness driver is installed.
>
>The problem is mentioned in forums periodically, i.e. the last reply in 
>http://qemu-forum.ipi.fi/viewtopic.php?t=2015 .
>
>I would really like to have this fixed; I am somewhat experienced and will do 
>what is needed for testing etc. I would try some CPU "mark" tests for a more 
>objective check - but which of them will work without DirectX? 
>
>  
>

Re: [Qemu-devel] win98 slow with kqemu

[Mikhail Ramendik]

On Tuesday 02 January 2007 12:54, Dan Sandberg wrote:

> On the other hand, if for instance VMware is able to run Windows 98 much
> faster (I do not have it so I can't test this) then my guess is that
> kqemu is the guilty part and does something wrong with 16-bit code.

Thanks. Will test with VMWare and report.

-- 
Yours, Mikhail Ramendik

Re: [Qemu-devel] win98 slow with kqemu

[Dan Sandberg]

...also make sure that you have installed the CPU usage reduction fix 
for Windows 98, se manual: 3.11.2.2
(The link in the manual seems to be dead, but working ones can be found 
using Google.)

/Dan


Mikhail Ramendik wrote:

>On Tuesday 02 January 2007 12:54, Dan Sandberg wrote:
>
>  
>
>>On the other hand, if for instance VMware is able to run Windows 98 much
>>faster (I do not have it so I can't test this) then my guess is that
>>kqemu is the guilty part and does something wrong with 16-bit code.
>>    
>>
>
>Thanks. Will test with VMWare and report.
>
>  
>