Messages in this thread | | | From | "John Que" <> | Subject | Re: NIC inerrupt | Date | Mon, 19 Apr 2004 18:01:42 +0300 |
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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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