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Performance issues with VBox+Android-x86
by Christian Menard 09 Nov '14

09 Nov '14

Hello everyone, I'm still working on NOVA(64)+VBox+Android_x86 on the Panasonic Toughpad FZ-M1 with Intel Core i5-4302Y CPU (With VT-X). After all the basic stuff is working my problem is that overall performance of the system is very bad. This issue is related to Genode as Android runs fast and with smooth animations on top of Linux+VBox and Linux+Qemu (on the same hardware). Do you have any ideas on what might be causing the performance issues or any hints on where to investigate? Here is what I know so far: I used VBox's built-in performance counters to investigate the issue. Based on these counters I found that a big portion of processing time is spend on 'other' tasks (most often more than 50%). This is described as "Time spent in the VMM or preempted recently." I found that during boot-up a lot of time is spend in the Recompiler, or more specific: on executing recompiled code. Here is an example of the performance counter as found after Android booted to welcome screen: /PROF/REM/Runcode 52808 ticks/call (112541953198 ticks, 2131148 times, max 9428119254, min 116) What surprises me here is the max value. Several billion ticks (should correspond to several seconds of processing time) seems to be very much for instruction emulation. However, only a small amount of time is spend in Runcode once Android is booted up. So if this is an issue, it would only speed up the boot. I also had a look at the graphics backend and found that a significant amount of time is spend on framebuffer updates. Here it might be possible to do some optimizations. However, tests showed that this is a not the major problem. The calculation done between two frames takes too long, in comparison the update of the frame itself is only a minor part. Recently there was a issue and a related commit added on github by Christian Prochaska. https://github.com/genodelabs/genode/issues/1284 I pulled this commit along with a chain of preceding changes. This significantly improved performance to a somewhat usable level but it is still way too slow. So far I did not test if this specific commit or some of the preceding commits are responsible for the increase in performance. All best Christian

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Genode doesn't see init when booting from grub2 on hard drive
by Nobody III 07 Nov '14

07 Nov '14

I've installed Genode on a partition on my hard drive, and configured Grub2 to boot it. However, Genode cannot find the ROM module "init". I configured Grub2 correctly--I used multiboot and added all the modules, including init. Note that I can boot from a cd with no problems besides graphics issues. I don't see any reason for the error besides Grub2 loading the modules differently. Is there any fix to make Genode compatible with Grub2? Could someone else try using Grub2 and see whether they get the same error?

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Binary Compatibility
by Nobody III 06 Nov '14

06 Nov '14

How reasonable would it be to make genode binaries (aside from core and init) compatible across different kernels? It seems that putting kernel-specific code into a shared library would work. How would this affect performance?

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Init Config Security
by Nobody III 06 Nov '14

06 Nov '14

It seems that with the init config files generated by the run scripts, if any server/driver is compromised, it can take over the system, by requesting access to important services, such as those in the <parent-provides> section. It seems that to make init's config secure, one would have to explicitly name every service needed by a server and deny access to all others. Am I correct? If not, please enlighten me.

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CPU frequency on i.MX53 QSB?
by David Goltzsche 06 Nov '14

06 Nov '14

Hi everyone, I still use my setup based on the tz_vmm runscript. I want to obtain the current cpu frequency in both secure and normal world. In linux, the sysfs directories for the cpu are empty. How can i read the current CPU frequency in genode? Maybe dynamic frequency scaling in unsupported and I can assume the CPU to always run at max frequency (1GHz in this case)? thanks! David

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ATA support
by Nobody III 06 Nov '14

06 Nov '14

Would it be reasonable to add libATA to DDE_Linux? I would like to run Genode on my computer and port various programs and libraries to Genode, but I can't get the ATA (ATAPI) driver to detect my hard drive (or my CD drive, for that matter). My computer's motherboard lacks AHCI support, and I don't feel inclined to buy a new computer for Genode, since my computer is good (has a quad-core processor and 4GB RAM) and is working just fine and I don't have a lot of money. As it is, unless I can get support for my hard drive, I'll probably have to drop Genode for about 4 years until I upgrade.

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Filesystem Permissions
by Nobody III 05 Nov '14

05 Nov '14

What is Genode's level of support for filesystem permissions?

1 0

Genode is out of frequency range on 1920x1080 monitor
by Nobody III 04 Nov '14

04 Nov '14

My computer has a 1920x1080 monitor, and, when I run Genode from a CD, my monitor gives me an "out of frequency range" error when it starts the terminal echo test. This seems to be a bug in fb_drv. I have an intel i915 graphics card, if that helps.

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ATAPI driver still not working
by Nobody III 03 Nov '14

03 Nov '14

The ATAPI driver is still unable to detect my hard drive (or my CD drive for that matter), even though I have switched to a 32-bit Genode system. Any help?

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Conference "New Directions in Operating Systems" in London
by Norman Feske 03 Nov '14

03 Nov '14

Hello everyone, I was made aware of the following event titled "New Directions in Operating Systems", which takes place on 25 November in London. http://operatingsystems.io The conference is organized by members of the Rump-kernel community. Since Genode is using Rump kernels, e.g., to provide file systems, there is an obvious connection between both projects. I am planning to attend and possibly give a talk. Maybe the conference is of interest to some of you, too? It would be a nice opportunity to catch up. ;-) Cheers Norman -- Dr.-Ing. Norman Feske Genode Labs http://www.genode-labs.com · http://genode.org Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

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