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"J. Roeleveld" <joost@××××××××.org> writes: |
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|
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> On Thursday, April 23, 2015 11:02:24 PM lee wrote: |
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>> hydra <hydrapolic@×××××.com> writes: |
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>> > You mean the documentation at Gentoo about Xen sucks or the upstream |
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>> > |
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>> > documentation? What information are you missing from there? Maybe we can |
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>> > add the missing pieces for Xen being more accessible and easier to use, |
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>> > what do you think? :) |
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>> |
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>> I mean the documentation they have on their wiki. It's a confusing mess |
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>> referring to various version with which things are being done |
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>> differently. |
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> |
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> The problem here is the different "implementations" that exist: |
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> - Xen (install and configure yourself, toolset: 'xl' , 'xm' is deprecated) |
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> - Citrix and XCP (pre-configured, install on dedicated server, toolset: 'xcp') |
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> - OVM (Oracle's implementation, not sure which toolset they use) |
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|
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Maybe, maybe not; the documentation is so confusing that I can't really |
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tell what it is talking about. |
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|
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>> Could you add missing pieces about why power management --- as in |
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>> frequency scaling --- doesn't work |
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> |
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> What doesn't work with this? |
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> The following seems quite detailed: |
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> http://wiki.xen.org/wiki/Xen_power_management |
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|
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There was some command to query what frequencies the CPUs are running |
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on, and it didn't give any output. Documentation seems to claim that |
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xen can do power management automagically, yet there was no way to |
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verify what it actually does. |
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|
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> And the commands listed there (for the hypervisor based option) work on my |
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> server. |
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> |
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>> and what to do about keeping the time |
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>> in sync between all VMs when you find out that this doesn't work as the |
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>> documentation would have you think it does? |
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> |
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> In what way doesn't it work? |
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> The clocks are all synchronized and I don't need to use anything like 'ntpd' |
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|
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The clocks were off by quite a bit after a while, and I had to use ntp |
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to get them in sync. Some documentation claims you don't need ntp or |
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anything; some other documentation apparently tries to explain that |
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keeping the clocks in sync cannot work unless the CPU(s) have some |
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features having to do with clock consistency while they are in sleep |
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states, and yet other documentation seems to say that using ntp cannot |
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work because xen screws it off. In the end, it was recommended to me to |
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use ntp, which I found to work. There was no way to figure out what xen |
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was actually doing or not doing towards this, and nobody seemed to know |
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how to keep the clocks in sync, other than using ntp, which appears to |
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be deprecated. |
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-- |
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Again we must be afraid of speaking of daemons for fear that daemons |
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might swallow us. Finally, this fear has become reasonable. |
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