[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: AW: Re: AW: Re: AW: Re: [Xen-devel] Xen 3.4 strange behaviour as compared to Xen 3.3.1
By the way: in the forum of my favorite distro (c't Server), I found another guy with exactly the same problem. 3.3.1 working, 3.4 no stepping up. BR, Carsten. Carsten Schiers schrieb: No it's the kernel of Xen 3.4.0 with the same config. I will try later with the older kernel, which is the one of 06.04.2009 (I have not realy understood the tagging or versioning of the Xen kernel). The other combination would be Xen 3.3.1 with the latest kernel. That's how we narrow it down to hypervisor vs. kernel.As I use cpufreq=dom0-kernel and enable cpufreq modules in drivers/cpufreq/Kconfig, I guess it should use the hypercall for idle time. But to double check, I generated load in dom0. No difference. It simply doesn't step upwards. The kernel with cpufreq debugging is enabled. I will also try it, maybe it's loging something usefull.BR, Carsten. -----Ursprüngliche Nachricht-----Von: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx] Gesendet: Samstag, 30. Mai 2009 11:30An: Carsten Schiers; xen-develBetreff: Re: AW: Re: AW: Re: [Xen-devel] Xen 3.4 strange behaviour as compared to Xen 3.3.1Are you using the exact same dom0 kernel as before, when it worked? Onetheory would be that dom0 is looking at its own idle stats, and it probably is pretty idle. So then it steps down the CPUs and keeps them down. When youwork the CPUs, are you working dom0 hard? -- Keir On 30/05/2009 07:59, "Carsten Schiers" <carsten@xxxxxxxxxx> wrote:Sorry, it's lowest frequency (1.0 out of 1.0, 1.8, 2.0, and 2.1 GHz). When booting,the CPU will be at 2.1 GHz, when switching the governor fromperformanceto ondemand,this one will set it to 1.0 GHz, where it's sort of fixed. I can setitmanually with cpufreq-set when switching to userspace governor, though. So my guess is that the ondemand governor donesn't get te right information about idle time though the according hypercall. I recompiled with CPUFREQ DEBUG set. But as said earlier, I don't have that much knowledge about how to debug kernels. BR, Carsten. -----Ursprüngliche Nachricht----- Von: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx] Gesendet: Freitag, 29. Mai 2009 23:31 An: Carsten Schiers; xen-devel Betreff: Re: AW: Re: [Xen-devel] Xen 3.4 strange behaviour as compared to Xen 3.3.1 Is lowest p-state lowest or highest frequency/voltage? -- Keir On 29/05/2009 17:47, "Carsten Schiers" <carsten@xxxxxxxxxx> wrote:Thanks Keir, I tried it out but there is no difference. And by theway:it is in lowest p-state and doesn't come up, even if under heavy load.Hmm.BR, Carsten. -----Ursprüngliche Nachricht----- Von: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx] Gesendet: Freitag, 29. Mai 2009 17:02 An: Carsten Schiers; xen-devel Betreff: Re: [Xen-devel] Xen 3.4 strange behaviour as compared to Xen 3.3.1 On 29/05/2009 15:03, "Carsten Schiers" <carsten@xxxxxxxxxx> wrote:- as already reported, ondemand manager in dom0-kernel doesn'tstep,manual setting works so it seems a bit like the communication betweendom0Could be an interaction with C-state support, preferring deep sleepand hypervisor regarding idle time is not workingtorunning at lower voltage/frequency? You could try no-cpuidle on Xen's command line at boot time and see if that changes things. -- Keir- all beside one domu use Xen 3.4.0 kernel, the one who uses it's customized kernel won't start up as first domu. It simply hangs and this prevents also all other domus (I all auto start them, no save/restore) don'tcomeup. When I start the chain with a different one and this (with thedifferentkernel) is started as #2 or #3, not problem - one domu is for vdr with three dvb pci cards passed trough. This one, when started as the first one, will cause xentop to show 20% load.Whenrestarted or started as #2, the load is like with 3.3.1 at roughly 3-5%._______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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