Re: NIC inerrupt

["John Que" <qwejohn@hotmail.com>]

Hello,
thnxs;
You are right in that I send about 4500-5000 packets in a second.
I will try to print it every 1000  packets and see.
john


>From: Bart Samwel <bart@samwel.tk>
>To: John Que <qwejohn@hotmail.com>
>CC: linux-kernel@vger.kernel.org
>Subject: Re: NIC inerrupt
>Date: Mon, 19 Apr 2004 16:40:08 +0200
>
>
>
>John Que wrote:
>>Hello,
>>
>>I want to count the number of times I reach an NIC receive
>>interrupt.
>>
>>I added a global static variable of type int , and initialized
>>it to 0 ; each time I am in the rx_interrupt of the card I incerement
>>it by one;
>>I got large , non sensible numbers after one or two seconds;
>>
>>So  for debug I added printk each time I increment it in rx_interrupt.
>>
>>What I see is that there are  unreasonable jumps in the number
>>
>>for instance , it inceremnts sequntially from 1 to 80,then jums to 4500, 
>>increments a little sequentially to 4580, and the jums again to
>>11000 ;
>>
>>Is it got to do with it that this is in interrupt?
>>Any idea what it can be ?
>
>You're probably reading the kernel output from syslog. Syslog periodically 
>reads out the printks from the kernel. With the amount of printks you're 
>doing you are probably printing info for about 4500 interrupts between 
>every time syslog checks for new kernel output, while the kernel buffer 
>that is used to store this information can only handle   enough data for 80 
>interrupts.
>
>--Bart

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