netdev - Re: [PATCH 2/4] Add new timeval_to

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Date:	Tue, 24 Jul 2007 19:20:48 +0530
From:	Varun Chandramohan <varunc@...ux.vnet.ibm.com>
To:	Patrick McHardy <kaber@...sh.net>
CC:	Oliver Hartkopp <socketcan@...tkopp.net>, netdev@...r.kernel.org,
	sri@...ibm.com, dlstevens@...ibm.com, varuncha@...ibm.com,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/4] Add new timeval_to_sec function

Patrick McHardy wrote:
> Varun Chandramohan wrote:
>   
>> Oliver Hartkopp wrote:
>>
>>     
>>>>> I don't think you should round down timeout values.
>>>>>  
>>>>>    
>>>>>      
>>>>>           
>>>> Can you elaborate on that? As per the RFC of MIB ,we need only seconds
>>>> granularity. Taking that as the case i dont understand why round down
>>>> should not be done?
>>>>  
>>>>    
>>>>         
>>> When you like to create any timeout based on your calculated value, you
>>> might run into the problem that your calculated value is set to _zero_
>>> even if there was "some time" before the conversion. This might probably
>>> not what you indented to get.
>>>
>>> So what about rounding up with
>>>
>>> return (tv->tv_sec + (tv->tv_usec + 999999)/1000000);
>>>
>>> ???
>>>
>>>  
>>>       
>> This can done.  Is this what you were ref to me, Patrick?
>>     
>
>
> Yes, timeouts should usually be at least as long as specified.
>   
Thanks Patrick and Oliver, ill round it up. :-)

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