On 06/14/2010 11:43 AM, Tejun Heo wrote:
quoted text
> Hello,
> 
> On 06/14/2010 11:21 AM, Jiri Slaby wrote:
>> On 06/13/2010 05:31 PM, Tejun Heo wrote:
>>> --- a/kernel/irq/spurious.c
>>> +++ b/kernel/irq/spurious.c
>> ...
>>
>>> @@ -25,9 +26,43 @@ enum {
>>>  	/* IRQ polling common parameters */
>>>  	IRQ_POLL_SLOW_INTV		= 3 * HZ,	/* not too slow for ppl, slow enough for machine */
>>>  	IRQ_POLL_INTV			= HZ / 100,	/* from the good ol' 100HZ tick */
>>> +	IRQ_POLL_QUICK_INTV		= HZ / 1000,	/* pretty quick but not too taxing */
>>>  
>>>  	IRQ_POLL_SLOW_SLACK		= HZ,
>>>  	IRQ_POLL_SLACK			= HZ / 1000,	/* 10% slack */
>>> +	IRQ_POLL_QUICK_SLACK		= HZ / 10000,	/* 10% slack */
>>
>> Hi. These are zeros on most systems (assuming distros set HZ=100 and
>> 250), what is their purpose then?
> 
> On every tick and no slack.  :-)

Hmmm... but yeah, it would be better to make IRQ_POLL_SLACK HZ / 250
so that we at least have one tick slack on 250HZ configs which are
pretty common these days.

Thanks.

-- 
tejun
--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/