I'm not sure about the 'sending more interrutps than can be handled' question. I thought that just before the kernel enters your interrupt handler then it turns interrupts off, but I could be wrong. However, I do know that staying in the interrupt handler for very long is a bad thing, and any length processing should be pushed off to the 'bottom half handler'. Actually, I believe the recommended way to do this in 2.4 kernel is with 'tasklets' rather than bottom half handlers. See chapter 9 in http://www.xml.com/ldd/chapter/book/index.html HTH dom > -----Original Message----- > From: Chandan K Shanbhag [mailto:cshanbha@students.uiuc.edu] > Sent: Tuesday, November 12, 2002 1:56 PM > To: kernelnewbies@nl.linux.org > Subject: newbie - interrupt handler problems > > > hi > I am writing a patch to the 2.4.19 kernel to measure > statistics of > packets sent on the n/w interfaces. I have a function that is > called when > net/core/dev.c:net_rx_action() is invoked to record received > packets. > Now this works fine when small amounts of data are sent on the > n/w. But doing a huge file transfer brings about a panic. > The trace says a NULL pointer reference occured and that the > interrupt handler was killed. The EIP > points to an instruction in my routine (as figured from > System.map). I am > checking for NULL values before I access anything. > This is what I think is the problem. This routine of mine takes > too long to be part of an interrupt handler. So, when I am > doing a massive > data transfer, the device is probably sending more interrupts > than can be > handled and something goes bad. Is this possible? And how do > I fix this. > > OR more generally, if I have a interrupt handler which > takes long, > is there some trick by which I can do less work in the > handler and move > the bulk of the work somewhere else. > > Thanks in advance > Chandan > > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
