What is the use of sysctl.d/99-powersave.conf for an SSD drive? #4
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That depends on what you mean with "not necessary", I suppose. If your goal is power saving, then you are probably correct in that it does not save as much power on an SSD as it does on an HDD (haven't tested how much of a difference, if any, it makes. I assume it would be negligible). However, less writing improves the lifespan of your SSD so in that sense you could deem it necessary (although, with modern SSDs, this is also not much of an issue anymore). In any case, it won't hurt to have them listed. Most of the entries in that file are currently commented, too. |
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Still it wouldn't be bad to specify that the powersaving impact of those
changes are probably minimal for SSDs. I would think that with a modern SSD
those settings are probably best left at the default values as the benefits
are very limited, and you pay a small price in responsiveness and amount of
data lost on a crash.
Thanks for the good job, by the way. Your tweaks are very comprehensive and
useful.
2017-01-27 11:50 GMT+01:00 Jente Hidskes <[email protected]>:
… That depends on what you mean with "not necessary", I suppose. If your
goal is power saving, then you are probably correct in that it does not
save as much power on an SSD as it does on an HDD (haven't tested how much
of a difference, if any, it makes. I assume it would be negligible).
However, less writing improves the lifespan of your SSD so in that sense
you could deem it necessary (although, with modern SSDs, this is also not
much of an issue anymore).
In any case, it won't hurt to have them listed. Most of the entries in
that file are currently commented, too.
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I'm planning on writing an in-depth blog post about these settings, in which I will definitely mention this. I'll add it to the README too.
They are left at the defaults, except for |
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Yeah, of course. Just wanted to make sure that it was clear that on SSDs
the settings do not change much.
All the best, thanks!
2017-01-28 15:44 GMT+01:00 Jente Hidskes <[email protected]>:
… Still it wouldn't be bad to specify that the powersaving impact of those
changes are probably minimal for SSDs.
I'm planning on writing an in-depth blog post about these settings, in
which I will definitely mention this. I'll add it to the README too.
I would think that with a modern SSD those settings are probably best left
at the default values as the benefits are very limited, and you pay a small
price in responsiveness and amount of data lost on a crash.
They *are* left at the defaults, except for vm.dirty_writeback_centisecs
(which, I admit, is a leftover from the time where I did not have an SSD -
I'll probably change it when I write that blog post). In this case I'd
still like to keep them in, if only to notify others of their existence. I
have not noticed a (however small) decrease in responsiveness nor
(increased) data loss on a system crash. In any case, feel free to change
the settings to whatever you prefer!
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No problem, I appreciate the message! |
Most of the content of
sysctl.d/99-powersave.confrefer to delaying disk writes, which should be, if I'm not mistaken, not necessary on an SSD drive. Is this wrong? Did you do any testing?Thanks
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