> > 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). > > How much performance do we gain by this? Till now i thought it's just 1-3% so > i'm still running ondemand govenor plus power savings. As always, it depends. I saw noticeable increases in some throughput tests (though I can't recall the % gain.) More important to me was that it made my fio results much more consistent. As we measure improvements, these settings remove some of the "system noise". Best, Paul > > Greets, > Stefan > > > Best Regards > > > > Andreas Bluemle > > > > > > > > > > > > > > On Wed, 8 Oct 2014 02:51:21 +0200 > > Mark Nelson <mark.nelson@xxxxxxxxxxx> 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 majordomo@xxxxxxxxxxxxxxx More > majordomo > >> info at http://vger.kernel.org/majordomo-info.html > >> > >> > > > > > > > > -- > > Andreas Bluemle mailto:Andreas.Bluemle@xxxxxxxxxxx > > 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 majordomo@xxxxxxxxxxxxxxx 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 majordomo@xxxxxxxxxxxxxxx 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 majordomo@xxxxxxxxxxxxxxx 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 majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
