Hi, Running under Fedora 8 32-bits I started running some UMLs. At one point I had 9 of them running. Then one of the UML Linux kernel started using 100% CPU (or very, very close to that). When compared to the others running UML kernels, that one had ps aux's VSZ and RSS fields in the 150-170 range whereas all the others had 0 and 0.
So I've terminated the processes on that note for that day. I might or might not see this again, so what I'd like to know are tips and hints about debugging such an issue. At least for providing a complete description here, or even perhaps to solve the problem. Now, the UML kernel is of the 2.6.24.2 variety, running under stock Fedora 8 32-bit (2.6.23.14). The host has 1 GB of RAM and runs a dual core type of CPU. The UMLs have default RAM. Maybe of note, the actual filesystem was taken from a system running 2.6.18. So at boot there are some warnings about not finding modules. The UML boots anyways. Some functionality is not present when compared to the original system, but I do not care that much about that at the moment. I don't know if that kernel/module mismatch could be a factor in this problem. The virtual setup is made of a virtual router connected on one side to a tap0 device, and the other side to a 'daemon' eg. a uml_switch. To that switch are connected 8 other UMLs. Is there a limit to connecting UMLs to a switch ? A typical UML )of the ones connected to the uml_switch) is created like this: ./linux ubda=cow1,testfs2 umid=uml1 eth0=daemon Others like the following: ./linux ubda=cow2,testfs2 umid=uml2 eth0=daemon ./linux ubda=cow3,testfs2 umid=uml3 eth0=daemon etc... What would typically cause a UML kernel to go and consume steadily close to 100% CPU ? Thanks for any suggestions ! Cheers. ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
