Hi Chao,
Unfortunately the classic memory system does not support X86 atomic RMW
operations. This is why it works in atomic and not in timing.
You options are:
1) implement a fix and do everyone a big favour (I vote for this one)
2) take the hit in simulation speed and switch to Ruby and stick to timing mode
3) use another ISA, e.g. ARM :-), that does not have this problem
I hope that explains it.
Andreas
From: Chao Zhang via gem5-users
<gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Reply-To: Chao Zhang <zhang.c...@pku.edu.cn<mailto:zhang.c...@pku.edu.cn>>,
gem5 users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Date: Wednesday, 27 August 2014 07:47
To: gem5 users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Subject: [gem5-users] How many cpu does the x86 vmlinux SMP kernel support?
Dear all,
I’m currently working on x86 FS on classical memory system to simulate cache
system. But I found the kernel booting just hangs before loading benchmark
script. It does not work when I set 3 or more x86 timing simple cpus, but it
does work when I set them as atomic cores. And it also works when I set cpu
number to 1. The gem5 change set version is 10242, the kernel is the SMP
version from gem5 website (x86_64-vmlinux-2.6.28.4-smp), and I use default
fs.py configuration.
So I want to know how many x86 timing cores does this SMP kernel support? Or is
this a memory system problem?
Chao Zhang
Peking University
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