Re: [gentoo-server] Windows NT4 on KVM+QEMU extremely slow...

[Preston Hagar]

On Thu, Apr 18, 2013 at 11:29 AM, Vinícius Ferrão <viniciusferrao@×××××××.br
> wrote:

> KVM is enabled in BIOS too.
>
> I doubled checked it. Disabled and even got a message saying the KVM is
> not available when Disabled in BIOS….
>
> Thanks,
>
>  *Vinícius Ferrão*: Administrador de Sistemas
> www.ferrao.eti.br | [phone]
>
> On Apr 18, 2013, at 11:29 AM, Robert Bridge <robert@××××××××.com>
>  wrote:
>
> Hi,
>
> Are you sure your hardware virt isn't disabled in the BIOS? It is, in
> my experience, the one BIOS setting the linux kernel doesn't/can't
> over-ride.
>
> Cheers,
> RobbieAB
>
> On 18 April 2013 01:35, Vinícius Ferrão <viniciusferrao@×××××××.br> wrote:
>
> Hello dudes,
>
> Thanks for the replies.
>
> But I've read somewhere that -no-kvm should be enabled in order to run NT4
> Properly.
>
> Anyway, I removed the flag and nothing really happened. It's still slow.
> It's usable, but slow. VMWare was much faster.
>
> And about the RAM issue. It's Windows NT4. I don't think more is necessary.
> The machine boots consuming only 30MB. And about the slowness of the system
> is during CPU intensive operations.
>
> Anything else to try dudes?
>
> Thanks,
>
> Vinícius Ferrão: Administrador de Sistemas
> www.ferrao.eti.br | [phone]
>
> On Apr 17, 2013, at 5:54 PM, Hinnerk van Bruinehsen
> <h.v.bruinehsen@×××××××××.de>
> wrote:
>
> On Wed, Apr 17, 2013 at 07:34:00PM +0000, Vinícius Ferrão wrote:
>
> Hello dudes,
>
> I'm running Windows NT 4 Terminal Server on QEMU and the performance is too
> slow; I don't even know how to debug it and I even don't if this is normal
> or not.
>
> On VMWare Player the performance was much better. And this isn't a
> migration. I've reinstalled the NT4 from the ground.
>
> Anyway; i'm launching the VM with this arguments:
> kvm -m 128m -name WinNT4TS -drive file=winnt4ts.raw -cdrom Windows\ NT\ 4\
> Terminal\ Server\ Image/WINNT-TSE40.iso -net
> nic,model=ne2k_pci,macaddr=00:0c:29:74:fa:b4 -net tap -vga std -cpu
> pentium,level=1 -smp 1 -no-acpi -no-hpet -no-kvm -boot c -vnc none
> -daemonize
>
>
> Hi,
>
> iirc the commandline switch --no-kvm disables kvm (so it'S just software
> emulated qemu). You disable hardware virtualization accerleration with
> it.
>
> Other than that: more than 128 MB ram will most likely also help to
> speed things up.
>
> WKR
> Hinnerk
>
>
>
>
>

You might try setting cache=writeback.  To do so, after the

file=winnt4ts.raw

make it

file=winnt4ts.raw,cache=writeback


It made a big difference for me with the MS Server 2003 I run with KVM.
 For reference, here is the kvm command that is run for my Win server 2003
VM (I migrated it from VMWare to KVM and now get the same or slightly
better performance):

/usr/bin/kvm -S -M pc-1.0 -cpu qemu64,-svm -enable-kvm -m 2048 -smp
1,sockets=1,cores=1,threads=1 -name antitrust -uuid
564dbb65-75b3-74bd-7252-d9749ee2697d -nodefconfig -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/antitrust.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime
-no-shutdown -boot c -drive
file=/var/data/vm/kvm/antitrust.img,if=none,id=drive-virtio-disk0,format=raw,cache=writeback
-device
virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0
-drive
file=/var/data/vm/kvm/virtio-win-0.1-52.iso,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw
-device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev
tap,fd=18,id=hostnet0 -device
e1000,netdev=hostnet0,id=net0,mac=00:0c:29:e2:69:7d,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device
isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charparallel0
-device isa-parallel,chardev=charparallel0,id=parallel0 -usb -device
usb-mouse,id=input0 -vnc 127.0.0.1:2 -vga vmware -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4