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[Qemu-devel] Knoppix results
From: |
Kyle Hayes |
Subject: |
[Qemu-devel] Knoppix results |
Date: |
Wed, 28 Jan 2004 22:11:00 -0800 |
User-agent: |
KMail/1.5.4 |
Here's my host system:
QEMU: 0.5.2 (binary from web site)
Linux: Gentoo 1.4 up to date (stable)
CPU: Pentium 4 2.6 GHz (recent stepping)
Mem: 512MB DDR PC3200
I've tried to install Knoppix within QEMU. I have had some luck, but not
succeeded with everything. I can boot it and it seems to run Linux without
any problems as long as I do not try to use X Windows. Where I have
difficulties is when I try to install Knoppix onto the "hard disk".
Here's the command line I'm using:
qemu -hda hda.img -cdrom knoppix.iso -boot d -m 128
The disk image hda.img is initially blank. I created it with:
dd if=/dev/zero of=hda.img bs=1M count=4096
This produces a 4GB file full of zeros.
I them use the command line above to boot the Knoppix CD image. I boot
Knoppix with the following command line:
boot: knoppix lang=us 2
The "2" tells Knoppix to boot into command line mode, not graphical mode. No
GUI will be used. I tried that, but Knoppix can't figure out X. It sees a
generic VESA-type card, but cannot actually use it for some reason.
Knoppix boots and I get a command prompt. Everything looks OK at this point.
I can look at directories and start and stop things. I cannot run any
graphical tools but that wasn't my aim at this point.
I can launch cfdisk from within Knoppix. However, it is somewhat hit or miss
whether or not I can partition the disk image that I created. I can usually
do one partition write and that is it. On the second one, I seem to have a
strong change of having QEMU hang while using 100% of the CPU. So, some
problem with disk IO?
After a couple of tries, I got the disk image ready and partitioned. Whenever
cfdisk hung QEMU, I had to kill the emulator and restart the process. I found
that the changes that were successfully written to the disk image were good,
so I was able to make forward progress.
I then launched knx-hdinstall. This script installs Knoppix onto the hard
drive. I get though initial setup (I can skip through the partitioning
because I did that separately) including formatting the hard disk image and
preparing the swap space. When it gets to the stage where it is copying
files from the Knoppix CD image to the hard disk image, it hangs using 100%
of the CPU before it completes copying the files.
I attempted knx-install twice. The first time it got to 30% complete and
hung. The second time it got to 9%. I tried a third time while I was
writing this email and the screen saver kicked in. The screen (well, the
window) went black and nothing I typed would restart it. I was able to
release the mouse (it had been grabbed into the window) and was able to kill
off QEMU. I guess I need to figure out how to stop the screen saver :-)
The first two times, I don't think the screen saver started before it hung.
The first time, I was able to release the mouse from QEMU. The second time I
didn't have the mouse grabbed by QEMU.
How can I help debug this? It seems very, very close. The only common theme
I can see between by two cases of hanging is disk IO. In the case of cfdisk,
it is low level disk IO and may be calling some weird things to write to the
partition table (you wouldn't think so, but there's something odd about it).
The second case, knx-hdinstall, seems to simply cause a lot of disk IO.
Perhaps "interrupts" are being lost or something?
Best,
Kyle
- [Qemu-devel] Knoppix results,
Kyle Hayes <=
- Re: [Qemu-devel] Knoppix results, Renzo Davoli, 2004/01/29
- Re: [Qemu-devel] Knoppix results, Johan Rydberg, 2004/01/29
- Re: [Qemu-devel] Knoppix results, Renzo Davoli, 2004/01/29
- Re: [Qemu-devel] Knoppix results, Kyle Hayes, 2004/01/29
- Re: [Qemu-devel] Knoppix results, Gabriel Ebner, 2004/01/29
- Re: [Qemu-devel] Knoppix results, Johan Rydberg, 2004/01/29
- Re: [Qemu-devel] Knoppix results, Kyle Hayes, 2004/01/30
- Re: [Qemu-devel] Knoppix results, Herbert Poetzl, 2004/01/30
- Re: [Qemu-devel] Knoppix results, Renzo Davoli, 2004/01/31
- Re: [Qemu-devel] Knoppix results, Fabrice Bellard, 2004/01/29