Just as previously posted, this is likely masking the issue, not solving it. I don't see a reason why the application would be generating an address that large. Either a instruction isn't being simulated correctly or a syscall is incorrect. In short it's a bug in the simulator and you're just ignoring it by increasing memory the way you are.
Ali On 25.07.2013 16:29, Mahmood Naderan wrote: > Hi > I think I found why randomly one receives this error: > > fatal: Unable to find destination for addr 0xNNN on bus system.membus > > A workaround for this issue is to increase the memory as discussed in > the following posts > http://www.mail-archive.com/gem5-users@gem5.org/msg04502.html [1] > http://www.mail-archive.com/gem5-users@gem5.org/msg05886.html [2] > > The roots for this error are some hard coded hex values in the > X86_64LiveProcess::X86_64LiveProcess(). For x86 this function is > located at src/sim/arch/x86/process.cc. Currently, the hard coded > values are in the range of 64GB but not every body who has built his > application on a 64-bit host, uses a 64GB RAM. > > In anther word, someone may compile his application with 8GB of > memory, but LiveProcess() and mmap() in gem5 will allocate some > virtual memory at the size of 64GB because of the hard coded numbers. > > Now what is wrong with that? The wrong is, these hard coded numbers > will overwrite the memory value defined in the configuration script > > system = System(cpu = cpus, physmem = > PhysicalMemory(range=AddrRange("4096MB")), membus = Bus()) > > That means, you might define a 4GB memory for gem5, but it will > allocate the whole 64GB address space for the virtual memory and > randomly (depends on how mmap allocate the address space) will fire > the "unable to find the destination addr" error message. > > I am not aware of other archs, but for x86 it is an error prone code. Links: ------ [1] http://www.mail-archive.com/gem5-users@gem5.org/msg04502.html [2] http://www.mail-archive.com/gem5-users@gem5.org/msg05886.html
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