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On Mon, Apr 2, 2012 at 7:57 AM, Pandu Poluan <pandu@××××××.info> wrote: |
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> |
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> On Apr 2, 2012 5:00 PM, "Robert David" <robert.david.public@×××××.com> |
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> wrote: |
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>> |
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>> Hi, |
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>> |
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>> maybe write your hw configuration first. Eg: CPUs, graphic cards, HDDs |
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>> (size, speed, type) and others. |
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>> |
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>> Also provide lspci output and /proc/cpuinfo. |
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>> |
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>> Then this is a server, maybe with more than one GB nic. If you dont use |
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>> spare nics disable them in bios. Do the same with other unneeded stuff. |
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>> |
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>> If you can access your server and replace cards, remove everything you |
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>> dont need. Do not lower fans or dont play with cpu voltage. If you want |
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>> to run this server 24/7 it can cause serious problems. It will not save |
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>> you much power. Paradoxly this could lead to higher power usage in |
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>> some cases, because of hotter devices. |
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>> |
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>> Remove spare memory cards, if you dont need much memory, etc. |
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>> |
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>> Robert. |
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>> |
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>> V Sun, 01 Apr 2012 17:04:58 +0200 |
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>> Jarry <mr.jarry@×××××.com> napsáno: |
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>> |
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>> > Hi, |
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>> > |
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>> > admin of a colo-center keeps complaining my server is going |
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>> > a little over power-limit (which they have set as ~120W per |
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>> > 24h/avg, while my server needs ~130-135W). So I need to find |
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>> > a way to save at least those 15W, or I will be moved to |
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>> > higher tarif (which means higher costs for server-housing). |
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>> > |
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>> > Before going hard(ware) way, I would like to try first |
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>> > all possible software solutions. What I tried up to now is |
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>> > cpufreqd, CONFIG_NO_HZ=y, and spindown. In addition to that |
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>> > I adjusted fan-speeds to a little lower values and turned |
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>> > off some unneeded peripherials (in bios). |
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>> > |
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>> > Is there anything else I could do? Any tips would be greatly |
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>> > welcomed... |
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>> > |
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>> > Jarry |
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>> > |
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>> |
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>> |
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> |
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> I'd rather have *more* RAM than causing unnecessary swaps. |
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> |
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> Try using a smaller swapfile to reduce swap tendencies. You can always push |
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> a larger swapfile into service when needed. |
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> |
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> There's also a kernel knob to set 'swappiness', but I forget what exactly. |
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> Try 'sysctl -a | grep swap' |
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|
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Swappiness is the knob you want to set if you want to reduce |
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swappiness. I set mine to 0; swap only when absolutely necessary. |
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|
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In /etc/sysctl.conf: |
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vm.swappiness = 0 |
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|
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On the command line: |
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sysctl -w vm.swappiness=0 |
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|
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-- |
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:wq |
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