Re: [PATCH v4] KVM: PPC Use clockevent multiplier and shifter for decrementer

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


On 18.04.2012, at 18:01, Bharat Bhushan wrote:

> Time for which the hrtimer is started for decrementer emulation is calculated using tb_ticks_per_usec. While hrtimer uses the clockevent for DEC reprogramming (if needed) and which calculate timebase ticks using the multiplier and shifter mechanism implemented within clockevent layer. It was observed that this conversion (timebase->time->timebase) are not correct because the mechanism are not consistent. In our setup it adds 2% jitter.
> 
> With this patch clockevent multiplier and shifter mechanism are used when starting hrtimer for decrementer emulation. Now the jitter is < 0.5%.
> 
> Signed-off-by: Bharat Bhushan <bharat.bhushan@xxxxxxxxxxxxx>

Thanks, applied to kvm-ppc-next with fixed commit message and fixed trailing whitespace :).


Alex

--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[KVM ARM]     [KVM ia64]     [KVM ppc]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Photo]     [Yosemite News]    [Yosemite Photos]    [Linux Kernel]     [Linux SCSI]     [XFree86]

Add to Google Powered by Linux