Hi all, I was doing an experiment with the Berkeley DB benchmark ex_tpc. What I notice is that increasing the disk latency from 1us to 10us causes the following: panic in a vanilla kernel:
panic: Inconsistent DMA transfer state: dmaState = 2 devState = 0 In addition, I notice that if I bind network and disk interrupts to a core, this error occurs in twice as many cases. The tested simulation featured two m5 default setting O3 cores (I have also seen the same DMA problem with simpler O3 models and the TimingSimpleCPU), the vanilla 2.6.27 m5 kernel and a 3 level cache (using the MESI express snoop protocol). I am currently running gem5-changeset:8339. I have also found this thread which seems to have a similar problem, but considers the x86 ISA and mentions that the APIC is the heart of the problem. http://www.mail-archive.com/[email protected]/msg03192.html If anyone happens to know how to fix the problem or efficient documentation on how Ide works, your thoughts and words would be greatly appreciated. Thanks, -Rick
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