Gleb Natapov, le Mon 17 Nov 2014 11:21:22 +0200, a écrit : > On Mon, Nov 17, 2014 at 10:10:25AM +0100, Samuel Thibault wrote: > > Jan Kiszka, le Mon 17 Nov 2014 10:04:37 +0100, a écrit : > > > On 2014-11-17 10:03, Samuel Thibault wrote: > > > > Gleb Natapov, le Mon 17 Nov 2014 10:58:45 +0200, a écrit : > > > >> Do you know how gnumach timekeeping works? Does it have a timer that > > > >> fires each 1ms? > > > >> Which clock device is it using? > > > > > > > > It uses the PIT every 10ms, in square mode > > > > (PIT_C0|PIT_SQUAREMODE|PIT_READMODE = 0x36). > > > > > > Wow... how retro. That feature might be unsupported - does user space > > > irqchip work better? > > > > I had indeed tried giving -machine kernel_irqchip=off to the L2 kvm, > > with the same bad performance and external_interrupt in the trace. > > > They are always be in the trace, but do you see them each ms or each 10ms > with user space irqchip?
The external interupts are every 1 *microsecond, not millisecond. With irqchip=off or not. Samuel -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
