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Date: Fri, 10 Dec 2010 10:17:51 +0530 From: Jaswinder Singh <jaswinderlinux@...il.com> To: Clemens Ladisch <clemens@...isch.de> Cc: "the arch/x86 maintainers" <x86@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: Hungry for hardware timers Hello, On Tue, Sep 7, 2010 at 4:25 PM, Clemens Ladisch <clemens@...isch.de> wrote: > Jaswinder Singh Rajput wrote: >> As per dmesg([ 0.325958] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0) >> so IRQs are like this : >> HPET T0 : 2 >> HPET T1 : 8 >> HPET T2 : 0 > > "0" means that the BIOS did not initialize it. In this case, the driver > will initializes it when accessed, with the first supported IRQ above 15. > On your HPET's T2, this is IRQ 20. > I have used /dev/hpet as periodic interrupt and it works great but settings for HPET_T2_CMP will be like this : 10 micro-seconds : 110 /* 0.00001 sec */ 100 micro-seconds : 1230 /* 0.0001 sec */ 1 milli-second : 13800 /* 0.001 sec */ 10 milli-seconds : 142580 /* 0.01 sec */ 100 milli-seconds : 1431150 /* 0.1 sec */ 1 second : 14317330 /* 1 sec */ 10 seconds : 143179330 /* 10 sec */ 100 seconds : 1431799400 /* 100 sec */ I do not have a oscilloscope so I am measuring it by using printks. I am curious, Why it is irregular. I am looking for one more timer interrupt handler, how can I get one more interrupt handler for user. Thanks, -- Jaswinder Singh. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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