QEMU just consumes CPU [SOLVED]

binro · Last edited by binro on Tue Feb 06, 2007 9:45 am; edited 1 time in total

I have completed my mammoth conversion to x86_64 and am testing things. I emerged the latest qemu (0.8.2) and copied my winxp.img file from the x86 system. When I modprobe kqemu that loads Ok but when I start qemu it just consumes a lot of CPU and no window appears. I am using the same parameters as before:

polle · Veteran Joined: 28 Feb 2003 Posts: 1498 Location: Belgium

binro · Posted: Mon Feb 05, 2007 11:56 am Post subject:

Thanks for the clarification. However, if I just use qemu I get:

polle · Veteran Joined: 28 Feb 2003 Posts: 1498 Location: Belgium

I don't know, but my xp starts fine like this:
qemu -hda /qemu/winxp.img -m 384 -boot c -soundhw es1370
but I suppose you use the same command as before when things worked?

binro · Posted: Mon Feb 05, 2007 12:36 pm Post subject:

I simplified it by leaving out the network stuff. The complete command that works on x86 is:

polle · Veteran Joined: 28 Feb 2003 Posts: 1498 Location: Belgium

And seems I also was wrong with my advice, found this on qemu website:

If you use kqemu on an x86_64 host, you must use `qemu-system-x86_64' instead of `qemu'.

binro · Posted: Mon Feb 05, 2007 1:30 pm Post subject:

binro · Posted: Tue Feb 06, 2007 9:45 am Post subject:

I thought I would work round this by installing the new 2.6.20 kernel and trying kvm. While building the modified qemu for kvm, I got a configure error that I had not installed SDL (got accidently ommited during my 64 bit rebuild) and wouldn't get any output! Bizarrely, the qemu ebuilds let you get away with this. Anyway, it certainly explains the behaviour I got.
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RedHand · Posted: Fri Feb 16, 2007 10:40 am Post subject:

So... What I have to do... My qemu just eat CPU.

binro · Posted: Fri Feb 16, 2007 10:51 am Post subject:

qemu eats cpu anyway but if you haven't had a window open up showing the system booting, check you have libsdl installed. That fixed it for me.

HTH
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"Ship me somewheres east of Suez, where the best is like the worst,
Where there ain't no Ten Commandments an' a man can raise a thirst"
from "Mandalay" by Rudyard Kipling

whig · l33t Joined: 27 Nov 2004 Posts: 973 Location: New Zealand

Does qemu eat cpu if the guest is (say) slackware and it is merely sitting at the console (no X)?

binro · Posted: Sat Feb 17, 2007 2:11 pm Post subject:

I guess it depends what else is going on. If Slackware is starting a lot of services, that could explain it.
_________________
"Ship me somewheres east of Suez, where the best is like the worst,
Where there ain't no Ten Commandments an' a man can raise a thirst"
from "Mandalay" by Rudyard Kipling

RedHand · Posted: Fri Feb 23, 2007 11:24 pm Post subject:

I have libsdl installed but windows with booting system didn't show.

binro · Posted: Sat Feb 24, 2007 9:31 am Post subject:

S_aIN_t · Guru Joined: 11 May 2002 Posts: 488 Location: Ottawa

so, what is the solution? i have the exact same problem :(

EDIT: ahh. the solution is to enable the "sdl" USE flag and rebuild qemu and its components. after doing that it works.
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quark · Posted: Tue Jul 17, 2007 8:27 pm Post subject:

Thanks a bunch guys. I had also omitted the sdl flag. IMHO this is a bug in the ebuild...

I am recompiling atm. Wish to get WinXP installed from laptop's recovery cd's. We'll see how it goes.
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HP Compaq nx9420 || Intel Core2 CPU T7200 @ 2GHz | 2Gb RAM | 120Gb HD
HP Compaq nc2400 || Intel Core Duo CPU U2500 @ 1.2 GHz | 2Gb RAM | 120Gb HD

quark · Posted: Tue Jul 17, 2007 8:29 pm Post subject:

Note that only app-emulation/qemu-softmmu has sdl as a USE flag. Hence, recompiling it should be enough.
_________________
HP Compaq nx9420 || Intel Core2 CPU T7200 @ 2GHz | 2Gb RAM | 120Gb HD
HP Compaq nc2400 || Intel Core Duo CPU U2500 @ 1.2 GHz | 2Gb RAM | 120Gb HD

quark · Posted: Tue Jul 17, 2007 8:57 pm Post subject:

Seems to be working... 'recovered' 13% of Window$. Hope there will be no use for that. Ever.
_________________
HP Compaq nx9420 || Intel Core2 CPU T7200 @ 2GHz | 2Gb RAM | 120Gb HD
HP Compaq nc2400 || Intel Core Duo CPU U2500 @ 1.2 GHz | 2Gb RAM | 120Gb HD

quark · Posted: Fri Jul 20, 2007 8:06 pm Post subject:

I was somewhat too optimistic... see this post.
_________________
HP Compaq nx9420 || Intel Core2 CPU T7200 @ 2GHz | 2Gb RAM | 120Gb HD
HP Compaq nc2400 || Intel Core Duo CPU U2500 @ 1.2 GHz | 2Gb RAM | 120Gb HD