Hi Shaikhul, I think clflush is not supported in Ruby caches at the moment. For reference, here is the original patch that added support for clflush instruction in gem5:
arch-x86: Adding clflush, clflushopt, clwb instructions (7401) · Gerrit Code Review (googlesource.com) <https://gem5-review.googlesource.com/c/public/gem5/+/7401> -Ayaz On Fri, Jun 16, 2023 at 2:49 PM Khan Shaikhul Hadi via gem5-users < gem5-users@gem5.org> wrote: > Hi, > When I include "clflush" instruction for out-of-order execution simulation > in MESITwoLevelCacheHeirarchy, it givis following error: > > build/X86/mem/ruby/system/RubyPort.cc:433: fatal: Ruby functional read >> failed for address 0x1f2b80 > > > Commenting out clflush operations seems to solve the problem. Any idea why > it could happen? does CLFLUSH properly implemented in Two Level MESI > protocol ? > > I'm not proficient in gem5 debugging, but what I've observed is that this > fatal error is caused by some read request packet, surprisingly not any > flush request. Also, If I commented out the fatal error message, system > gives warning as follows: > > build/X86/mem/ruby/system/RubyPort.cc:267: warn: Cache maintenance >> operations are not supported in Ruby. > > > and completes execution, no crash or other type of error message. I don't > know what "Cache maintenance operations" means here and is it related to > the previous error. > > I'm pretty confused and can't figure out how to approach. Anyone have any > suggestions ? I want to understand how clflush operation is simulated in > gem5 so that I could modify it for my research needs. I have attached my > configuration script and workload C++ file here. > _______________________________________________ > gem5-users mailing list -- gem5-users@gem5.org > To unsubscribe send an email to gem5-users-le...@gem5.org >
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