-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 In my experience with HP hardware, it was set to Econo mode in the BIOS which is just plain junk. It will halt cores without respect to workload to provide energy savings. We found that by setting the power mode to "OS controlled" we got almost the same performance as the "Max performance" setting, but while at the same time consuming about the same power as the Econo mode. The kernel is much better at putting cores to sleep, making sure there is adequate reserve capacity, and making sure that they are woken up faster when load is increasing. By selecting "Econo or max performance" profiles, the CPU loses control of the sleep states. My recommendation is before tweaking any other setting, change the performance profile to "OS controlled" and then go from there. -----BEGIN PGP SIGNATURE----- Version: Mailvelope v0.13.1 Comment: https://www.mailvelope.com wsFcBAEBCAAQBQJVZJopCRDmVDuy+mK58QAAXzMQAJdCFOOcTveCY68WQFHN /sXrRdMKye9h2JKz+ftjDUCjPQwjybVTL1jySNX/GjyYJBAVJlR/XklYMUYz Tvp65yprVEjXDnEbBNsJBw758MKfWcfwm/qaGtLpXOjj1aFvcuUILCHQp2VS AIfEaP9ITjndaoljpebtqlWopvx64+q+qslb44zUR6rBHJyDD8X52GX8MGr0 D1u2CxKnga9/mRuQ5daF5h0bida9aX06CqpZkAe900gx4Ia/1fodIHKMpF/1 BanRlkio35483675QJVnIrLKg0s2mNrhyFWo7gfPOky1ZPmKfBALGFl8O2Cy Hl2RygMOFKQ4tESKFn+AH8Y7/OtaSVOhRqBddx/Bh5ozyMFg4o6iWKKN6NOO VPkYyEn5pYSMJga0sPffwOqLZYQ5AiB2zceW92MT5/R6yIVme5RvWJrot+pk HsF1S1F26JEbl2ugMxd6aZk4RbesDMcvMnaQE6pVV3v+Zqv82UXmCNX14kKE cDS/nLnKQKM2ehh2TLbFomZvFk4XXx4+ri/7A1vlqbisa+iedxaNrqG+wNY0 Q5fT44s+JTWZxCcxadhka0HQ4tguEvTXg83D/PGAkjo6BX7avUv5uiyDGMOw HBWS9/Cy98EH2gDKvWOq2DMDiSvIY+aLZ5W8tFX+D+rsE6DwrvN8fUDxyG6C dsN2 =u7g4 -----END PGP SIGNATURE----- ---------------- Robert LeBlanc GPG Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1 On Tue, May 26, 2015 at 5:53 AM, Lionel Bouton <lionel+ceph at bouton.name> wrote: > On 05/26/15 10:06, Jan Schermer wrote: > > Turbo Boost will not hurt performance. Unless you have 100% load on all > cores it will actually improve performance (vastly, in terms of bursty > workloads). > The issue you have could be related to CPU cores going to sleep mode. > > > Another possibility is that the system is overheating when Turbo Boost is > enabled. In this case it protects itself by throttling back the core > frequencies to a very low value (it may use other means too, like lowering > the system buses frequencies, halting the cores periodically, ...). This > would explain the high loads. > If the system switches back and forth between normal loads and huge loads > and you can link that to CPU package temperature (and/or very low CPU core > frequencies), this is probably the cause. If the ambient temperature isn't a > problem (below 25?C any system should be fine and most can tolerate 30?C or > more) then you have an internal cooling problem. > > Best regards, > > Lionel > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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