Rosyna Keller on Twitter: "@danielpunkass @mjtsai (OS X detects drives in most USB/FireWire enclosures as non-SSD, even if they are SSDs)"

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Michael Tsai ‏@mjtsai Mar 17

@danielpunkass Nope, Time Machine has always been much slower for local backups, too.
Rosyna Keller ‏@rosyna Mar 17

@mjtsai @danielpunkass I believe it's intentional, so actions after OS X updates remain responsive. Also affects Spotlight, cache rebuilding
Daniel Jalkut ‏@danielpunkass Mar 17

@rosyna @mjtsai They should at LEAST jack up CPU priority when in that focused restore browser.
1 like
Rosyna Keller ‏@rosyna Mar 17

@danielpunkass @mjtsai CPU isn't throttled. The bottleneck is disk I/O. (lowpri_throttle_enabled is an I/O throttle, not a CPU throttle)
Rosyna Keller ‏@rosyna Mar 17

@danielpunkass @mjtsai You can independently confirm it's an I/O throttle by looking at the source that uses it, http://www.opensource.apple.com/source/xnu/xnu-2422.1.72/bsd/miscfs/specfs/spec_vnops.c?txt …
1 retweet 1 like
Rosyna Keller ‏@rosyna Mar 17

@danielpunkass @mjtsai Throttling disk I/O has a side effect of lowering CPU use by reducing working set. But that's not the main goal.
Rosyna Keller ‏@rosyna Mar 17

@danielpunkass @mjtsai There are even different throttles used depending on if the device is seen as an SSD or not an SSD by the system!
Daniel Jalkut ‏@danielpunkass Mar 17

@rosyna @mjtsai Cool, well in that case they should jack up I/O while in that mode! :)
Rosyna Keller ‏@rosyna Mar 17

@danielpunkass @mjtsai Agreed. But Disk I/O + Interface overhead + Network conditions are still going to severely limit restore speed.
1 like
Rosyna Keller ‏@rosyna Mar 17

@danielpunkass @mjtsai Since I'm guessing a lot of people use external disks for backup, which use the HDD throttle, not the SSD throttle.

‏@rosyna

@danielpunkass @mjtsai (OS X detects drives in most USB/FireWire enclosures as non-SSD, even if they are SSDs)

6:35 PM - 17 Mar 2016

Rosyna Keller

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