hi, >>BTW, I am using Ubuntu 14.04 LTS and couldn't find any sysfs entry like >>'cpufreq'..
check this arch wiki about kernel modules needed https://wiki.archlinux.org/index.php/CPU_frequency_scaling Also note that all theses tuning can normaly be done at bios level. (on last dell servers bios, setting power profile to max performance, is setting the governor to max and disable all cstate) I'm always doing it on my kvm hypervisors hosts. They are also the C1E option to disable on AMD processor. ----- Mail original ----- De: "Somnath Roy" <[email protected]> À: "Andreas Bluemle" <[email protected]>, [email protected] Envoyé: Mercredi 8 Octobre 2014 19:38:26 Objet: RE: 10/7/2014 Weekly Ceph Performance Meeting: kernel boot params Thanks Andres for sharing this. I will try those out. BTW, I am using Ubuntu 14.04 LTS and couldn't find any sysfs entry like 'cpufreq'.. root@stormeap-4:~# ll /sys/devices/system/cpu/cpu10/ cache/ crash_notes driver/ microcode/ online subsystem/ topology/ cpuidle/ crash_notes_size firmware_node/ node0/ power/ thermal_throttle/ uevent I am using Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz. Regards Somnath -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Andreas Bluemle Sent: Wednesday, October 08, 2014 9:33 AM To: [email protected] Subject: Re: 10/7/2014 Weekly Ceph Performance Meeting: kernel boot params Hi, as mentioned during today's meeting, here are the kernel boot parameters which I found to provide the basis for good performance results: processor.max_cstate=0 intel_idle.max_cstate=0 I understand these to basically turn off any power saving modes of the CPU; the CPU's we are using are like Intel(R) Xeon(R) CPU E5-2640 v2 @ 2.00GHz Intel(R) Xeon(R) CPU E5-2630 0 @ 2.30GHz At the BIOS level, we - turn off Hyperthraeding - turn off Turbo mode (in order ot not leave the specifications) - turn on frequency floor override We also assert that /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor is set to "performance" Using above we see a constant frequency at the maximum level allowed by the CPU (except Turbo mode). Best Regards Andreas Bluemle On Wed, 8 Oct 2014 02:51:21 +0200 Mark Nelson <[email protected]> wrote: > Hi All, > > Just a remind that the weekly performance meeting is on Wednesdays at > 8AM PST. Same bat time, same bat channel! > > Etherpad URL: > http://pad.ceph.com/p/performance_weekly > > To join the Meeting: > https://bluejeans.com/268261044 > > To join via Browser: > https://bluejeans.com/268261044/browser > > To join with Lync: > https://bluejeans.com/268261044/lync > > > To join via Room System: > Video Conferencing System: bjn.vc -or- 199.48.152.152 Meeting ID: > 268261044 > > To join via Phone: > 1) Dial: > +1 408 740 7256 > +1 888 240 2560(US Toll Free) > +1 408 317 9253(Alternate Number) > (see all numbers - http://bluejeans.com/numbers) > 2) Enter Conference ID: 268261044 > > Mark > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" > in the body of a message to [email protected] More majordomo > info at http://vger.kernel.org/majordomo-info.html > > -- Andreas Bluemle mailto:[email protected] ITXperts GmbH http://www.itxperts.de Balanstrasse 73, Geb. 08 Phone: (+49) 89 89044917 D-81541 Muenchen (Germany) Fax: (+49) 89 89044910 Company details: http://www.itxperts.de/imprint.htm -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies). -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
