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Linux Kernel Power Management Targeting Memory

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  • curaga
    replied
    Originally posted by GreatEmerald View Post
    It's called an SSD
    Screw your SSD, my ram drive is many times faster than the SATA-3 bus

    Leave a comment:


  • liam
    replied
    Originally posted by uid313 View Post
    However, on ARM systems such as smartphones and tablets, what draw the most power is the screen.
    While that is true, when you look at good reviews of devices, you see significant differences in phones/tablets with similar screen sizes.
    Apple sports a pretty impressive power management system (across all their devices) that shows up even when correcting for screen power draw. So, looking at other parts of the system can make a huge difference (more than this 6%, even).
    Look at the latest big Anandtech review of the HTC One. The iphone 5 tops, or near the top, for every battery test they have the least amount of control over (telephony being a part they just have to accept from whoever makes their telephony chips).

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  • GreatEmerald
    replied
    Originally posted by Luke_Wolf View Post
    But.... RAMDrive....
    It's called an SSD

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  • Luke_Wolf
    replied
    Originally posted by schmidtbag View Post
    Considering the overkill amount of RAM people buy these days, entire RAM modules could be completely ignored by the OS, which would save a decent amount of power.
    But.... RAMDrive....

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  • schmidtbag
    replied
    Originally posted by uid313 View Post
    ARM draws little power, so 6% power save show up as significant.
    However, on ARM systems such as smartphones and tablets, what draw the most power is the screen.

    On x86 processors, the power saved would be negligible.
    I think it depends on how this works. For example, I'm pretty sure you can't (effectively) tell a particular column in a single memory chip to operate in a lower-power state while the rest of the IC is at full power. However, you might be able to lower the power consumption of an entire memory chip in a DIMM, but perhaps the entirety of DIMMs are what get affected. Anyways, nearly all ARM SoCs involve a single IC for RAM, and if I'm right about individual columns/rows being unable to change their power state, then ARM systems will get a 0% benefit from this.

    I feel like the people who would benefit from this most are those who have 4+ DIMMs and are either overclockers or use ECC memory. Considering the overkill amount of RAM people buy these days, entire RAM modules could be completely ignored by the OS, which would save a decent amount of power.
    Last edited by schmidtbag; 04-10-2013, 10:20 AM.

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  • jrch2k8
    replied
    Originally posted by uid313 View Post
    ARM draws little power, so 6% power save show up as significant.
    However, on ARM systems such as smartphones and tablets, what draw the most power is the screen.

    On x86 processors, the power saved would be negligible.
    in a regular x86 Desktop would be negligible but it could help to extend RAM life, now on ARM and x86 Servers gain could be very important especially in high density setups

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  • curaga
    replied
    Say that to the caching server that has no screen and 1TB of RAM

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  • uid313
    replied
    ARM draws little power, so 6% power save show up as significant.
    However, on ARM systems such as smartphones and tablets, what draw the most power is the screen.

    On x86 processors, the power saved would be negligible.

    Leave a comment:

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