Messages in this thread |  | | From | (H. Peter Anvin) | Subject | Re: [LINUX-KERNEL] HDD Noise stopped with cat /dev/zero | Date | 23 Oct 1996 17:14:36 GMT |
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Followup to: <3263CA11.174720A3@infomaniak.ch> By author: Alexandre Maret <amaret@infomaniak.ch> In newsgroup: linux.dev.kernel > > this looks like : "my CPU is cooler when running linux than DOS" > but it isn't. I don't see any reason for this to happen... maybe > you did smoke something illegal... :) >
Actually, the CPU modulates several ampere of D.C. current depending on usage (current consumption is lower in the HLT state, hence the CPU runs cooler...) If the power supply is bad, these variations can easily be passed on as voltage drops to other components in the system, and as someone else points out, hard drives are blatantly microphonic.
cat /dev/zero does exactly one thing: it keeps the CPU running 100% of the time. Hence, if that quiets the machine, it is a pretty safe bet that the noise heard is derived from the varying current consuption of the CPU.
-hpa -- Not speaking for Transmeta in any shape, way, or form.
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