Avi Kivity wrote: > Jan Kiszka wrote: >> Avi Kivity wrote: >> >>> Jan Kiszka wrote: >>> >>>> It's both: -rt tests were performed with nosmp (-rt locks up under SMP >>>> here), and the Xenomai tests, including the last instrumentation, ran in >>>> SMP mode. So I tend to exclude SMP effects. >>>> >>>> Do you have some suggestion how to analyse what the guest is executing >>>> while those IRQs are delayed? As I said, I suspect some interaction of >>>> the Bochs BIOS is triggering the effect, because it only shows up (with >>>> a Linux guest) before the BIOS prints the first messages. >>>> >>>> >>> The guest is probably spinning. Can you try modifying >>> user/test/bootstrap.S, around the start label, to look like >>> >>> start: jmp start >>> >>> ? This can then be executed with >>> >>> user/kvmctl user/test/bootstrap user/test/access.flat >>> >> Access flat is not being built here (kvm-48), or I'm pressing the wrong >> button. Forcing it with "make test/access.flat" gives build errors. >> What's the trick? >> >> > > Sorry, it's x86_64 specific. Just pick any other small file, since it > won't be executed anyway, and there are no format requirements. > >>> This will give us something consistent to test. The output of kvm_stat >>> should also be interesting (should show exits and irq_exits advancing at >>> 10K/sec). >>> >> You probably mean with the artificial test, not with qemu/kvm. >> >> > > Yes. >
I ran user/kvmctl user/test/bootstrap user/test/smp.flat with the busy loop hacked into bootstrap, but I got no latency spots this time. And what should I look for in the output of kvm_stat? Jan -- Siemens AG, Corporate Technology, CT SE 2 Corporate Competence Center Embedded Linux ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
