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Linux 3.15 Will Suspend & Resume Much Faster

Posted by Soulskill on from the cutting-into-my-foot-tapping-time dept.

An anonymous reader writes "The Linux 3.15 kernel now in its early life will be able to suspend and resume much faster than previous versions of the Linux kernel. A few days ago we saw ACPI and Power Management updates that enable asynchronous threads for more suspend and resume callbacks. Carrying out more async operations leads to reduced time for the system suspend and then resuming. According to one developer, it was about an 80% time savings within one of the phases. On Friday, work was merged that ensured the kernel is no longer blocked by waiting for ATA devices to resume. Multiple ATA devices can be woken up simultaneously, and any ATA commands for the device(s) will be queued until they have powered up. According to an 01.org blog post on the ATA/SCSI resume optimization patches, when tested on three Intel Linux systems the resume time was between 7x and 12x faster (not including the latest ACPI/PM S&R optimizations)."

3 of 117 comments (clear)

  1. Caution by arth1 · · Score: 5, Insightful

    There's a reason why RAID controllers tend to wake up drives sequentially. The power load of waking up 20 hard drives at the same time can be tremendous compared to the load when they're all spinning and purring. So you don't do that.

    So I hope that power draw is taken into account, and that there will be options to limit the number of devices woken up simultaneously.

    1. Re:Caution by K.+S.+Kyosuke · · Score: 5, Insightful

      Something tells me that machines with a heavily RAID-ed disk subsystem are not exactly your usual candidates for frequent power cycles.

      --
      Ezekiel 23:20
  2. not fast by lgalindo · · Score: 3, Insightful

    will be happy if it does it right ...