[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] CAP and performance problem
On gio, 2013-06-06 at 15:55 +0200, Massimo Canonico wrote: > On 06/06/2013 03:02 PM, Juergen Gross wrote: > > You added the boot parameter for the hypervisor, not dom0? > Fedora, after few seconds, asks you which kernel do you want to use. You > can add some parameter in the command line who launches the kernel. So, > I add "cpufreq=none" in the command line. > IIRC, that won't do, as you're most likely modifying Dom0 command line, you need to be sure you're adding that bit to the Xen boot command line. I think you can do that dynamically, by editing the grub2 parameters on-line, as you're saying you did, but you have to make sure you affect Xen and not Linux. IIRC Otherwise, you should go to /etc/default/grub (I think), look for something like GRUB_CMDLINE_XEN (I think) add the "cpufreq=none" string there and regenerate grub.cfg by running: # grub2-mkconfig -o /boot/grub2/grub.cfg After that, I recommend double checking that /boot/grub2/grub.cfg has it, and has it in the right place. Feel free to post it here, if you're not sure about that... > > Could you try: > > > > xl vcpu-list; sleep 10; xl vcpu-list > > > > when the test is running and post the output? > > > > > > Juergen > > > here we go: > > [root@csitest ~]# xl vcpu-list; sleep 10; xl vcpu-list > Name ID VCPU CPU State Time(s) CPU > Affinity > Domain-0 0 0 0 --- 23.0 0 > Domain-0 0 1 0 --- 10.5 0 > Domain-0 0 2 0 --- 8.5 0 > Domain-0 0 3 0 r-- 6.8 0 > rubis-web 1 0 2 r-- 2968.5 2 > Name ID VCPU CPU State Time(s) CPU > Affinity > Domain-0 0 0 0 --- 23.0 0 > Domain-0 0 1 0 r-- 10.6 0 > Domain-0 0 2 0 --- 8.5 0 > Domain-0 0 3 0 --- 6.8 0 > rubis-web 1 0 2 r-- 2973.5 2 > So, rubis-web's vcpu ran for 5 secs, which sounds right. I see why Jurgen asked you to do that, but not how he plans to squeeze anything more than that from these numbers... Waiting for him to enlighten us again! ;-P > Concerning the George's question: > > Have you checked your BIOS for performance settings? > I'm not sure what you mean for "BIOS perfomance settings". To my best > knowledge, in the BIOS I have to be sure that the "hw virtualization" is > enabled. > I think he was referring to something related to poerformance vs. power management, i.e., cpufreq/speedstep tweaks, and stuff like that, if ou have any in the BIOS... Do you? Regards, Dario -- <<This happens because I choose it to happen!>> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) Attachment:
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