On Tue, 2025-03-11 at 15:59 +0100, Greg Kroah-Hartman wrote: > 5.10-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: David Woodhouse <dwmw@xxxxxxxxxxxx> > > commit 70e6b7d9ae3c63df90a7bba7700e8d5c300c3c60 upstream. > > Leaving the PIT interrupt running can cause noticeable steal time for > virtual guests. The VMM generally has a timer which toggles the IRQ input > to the PIC and I/O APIC, which takes CPU time away from the guest. Even > on real hardware, running the counter may use power needlessly (albeit > not much). > > Make sure it's turned off if it isn't going to be used. > > Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx> > Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Tested-by: Michael Kelley <mhkelley@xxxxxxxxxxx> > Link: https://lore.kernel.org/all/20240802135555.564941-1-dwmw2@xxxxxxxxxxxxx > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> You probably want commit 531b2ca0a940ac ("clockevents/drivers/i8253: Fix stop sequence for timer 0") too, to make sure it *does* actually stop the PIT correctly.
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