Messages in this thread | | | From | Larry Butler <> | Subject | Re: [patch] IPMI driver for Linux | Date | Wed, 21 Aug 2002 14:41:40 -0600 |
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Corey,
I've been working on a driver too because the busy waits in the drivers that are out there can hold a CPU for too long. I've measured as much as 120ms.
First I tried sleeping in the driver until the very next jiffy. I found that my driver became unreliable under high CPU load because the scheduling delays were too long. I even managed wedge the BMC on one of my test systems in a way I can't seem to fix. :)
What I finally settled on was using the timer interrupt. This seems to work well both in terms of being nice to the rest of the system (I register a shared irq handler only while I need it) and being reliable even under high load. So, just consider it a suggestion. I'd like to see your driver included too. It's certainly more complete than mine. You must have access to more documentation than I do.
Larry
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