Hi Zehan,

The o3 CPU will invariably take roughly 5-10x as long due to the level of 
detail. Are you suggesting the atomic CPU and the o3 CPU are not executing the 
same instructions?

Typically in these cases you want to drop a checkpoint before the region of 
interest.

Andreas

From: Zehan Cui via gem5-users <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Reply-To: Zehan Cui <zehan....@gmail.com<mailto:zehan....@gmail.com>>, gem5 
users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Date: Tuesday, 20 January 2015 02:14
To: gem5-users <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
Subject: [gem5-users] one cpu keeps executing "@flush_tlb_others+133"

Hi all,

I run a multi-threaded application in full system mode with detailed cpu model. 
I extract the instruction traces of each cpu, and find that the last cpu keeps 
executing instructions like the following for at least 1 billion instructions 
(The max_instructions is set to 1 billion).

8007580397289: system.switch_cpus_17 T0 : @flush_tlb_others+133    :   NOP      
                : IntAlu :
8007580397289: system.switch_cpus_17 T0 : @flush_tlb_others+135    : cmp    
DS:[rbp], 0
8007580397289: system.switch_cpus_17 T0 : @flush_tlb_others+139    : jnz    
0xfffffffffffffff8
8007580397602: system.switch_cpus_17 T0 : @flush_tlb_others+133    :   NOP      
                : IntAlu :
8007580397602: system.switch_cpus_17 T0 : @flush_tlb_others+135    : cmp    
DS:[rbp], 0
8007580397602: system.switch_cpus_17 T0 : @flush_tlb_others+139    : jnz    
0xfffffffffffffff8
8007580397915: system.switch_cpus_17 T0 : @flush_tlb_others+133    :   NOP      
                : IntAlu :
8007580397915: system.switch_cpus_17 T0 : @flush_tlb_others+135    : cmp    
DS:[rbp], 0
8007580397915: system.switch_cpus_17 T0 : @flush_tlb_others+139    : jnz    
0xfffffffffffffff8
8007580398228: system.switch_cpus_17 T0 : @flush_tlb_others+133    :   NOP      
                : IntAlu :


I run the application with atomic cpu model. The same instruction sequence 
appears for a while, but soon switches to the instructions of the application.

Such problem has bothered me for a while. Does anyone understand this?

thanks,
zehan

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