There is some issue with the o3 cpu not re-executing this load before commit (because it's uncacheable). You'll need to track the sequence number (sn) through execution in the O3 cpu and see why it wasn't re-executed and debug it.
Thanks, Ali On 06.08.2012 07:55, Ali chaker wrote: > Hi, > > I have a question regarding L2 Latency. I've run the BBench benchmark with 2MB L2 size and @600MHZ. when I used 30 ns and 34 ns L2 Latency it works fine. But when I used 32ns or 35ns or 25ns I've the following error (I used Cache debug flag). > > ANIC: UNCACHABLE LOAD [SN:4304D08] PC (0XC016E0C0=>0XC016E0C4).(0=>1) > > @ CYCLE 983526217577 > > [INVOKE:BUILD/ARM/ARCH/GENERIC/DEBUGFAULTS.HH, LINE 94] > > MEMORY USAGE: 532200 KBYTES > > PROGRAM ABORTED AT CYCLE 983526217577 > > /TMP/1343295426.694498: LINE 8: 16024 ABORTED (CORE DUMPED) $USER_STARTER > > 024952552855: SYSTEM.CPU0.DCACHE: REPLACEMENT: REPLACING FBE1640 WITH FA4D640: WRITEBACK > > 1024952552855: SYSTEM.CPU0.DCACHE: BLOCK ADDR FA4D640 MOVING FROM STATE 0 TO 15 > > 1024952562856: SYSTEM.L2: WRITEBACK FBE1640 MISS > > 1024952562856: SYSTEM.L2: REPLACEMENT: REPLACING F4A1640 WITH FBE1640: WRITEBACK > > 1024952579501: SYSTEM.CPU1.DCACHE: HANDLING RESPONSE TO 18000000 > > 1024952602864: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) 37900 HIT > > 1024952614533: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) 4A0C0 HIT > > 1024952626202: SYSTEM.CPU0.DCACHE: READREQ F82C014 HIT > > 1024952639538: SYSTEM.CPU0.DCACHE: READREQ FA4D674 HIT > > 1024952712886: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) 37900 HIT > > 1024952717887: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) 4A0C0 HIT > > 1024952726222: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) B1940 HIT > > 1024952736000: SYSTEM.L2: HANDLING RESPONSE TO 18000000 > > 1024952759562: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) 37900 HIT > > 1024952764563: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) 4A0C0 HIT > > 1024952772815: SYSTEM.CPU1.DCACHE: HANDLING RESPONSE TO 18000000 > > 1024952772898: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) B1940 HIT > > 1024952777899: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) 4A180 MISS > > 1024952781233: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) 4A0C0 HIT > > 1024952782899: SYSTEM.CPU0.DCACHE: SNOOPED A READREQ REQUEST FOR ADDR 4A180, NEW STATE IS 5 > > 1024952782899: SYSTEM.L2: READREQ (IFETCH) 4A180 HIT > > 1024952787901: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) 4A180 MISS > > 1024952792902: SYSTEM.L2: READREQ FA73420 HIT > > 1024952794569: SYSTEM.CPU0.ICACHE: READREQ (IFETCH) 65500 HIT > > PANIC: UNCACHABLE LOAD [SN:3FEB786] PC (0XC016E0CC=>0XC016E0D0).(0=>1) > > @ CYCLE 1024952796236 > > [INVOKE:BUILD/ARM/ARCH/GENERIC/DEBUGFAULTS.HH, LINE 94] > > MEMORY USAGE: 549880 KBYTES > > PROGRAM ABORTED AT CYCLE 1024952796236 > > /TMP/1343986785.1150779: LINE 8: 5478 ABORTED (CORE DUMPED) $USER_STARTER BUILD/ARM/GEM5.OPT --DEBUG-FLAGS=CACHE CONFIGS/EXAMPLE/FS.PY --KERNEL=VMLINUX.SMP.MOUSE.ARM --DISK-IMAGE=ARMV7A-GINGERBREAD-ANDROID.SMP.MOUSE.NOLOCK.IMG -B BBENCH --CACHES --L2CACHE --CPU-TYPE=ARM_DETAILED -N 4 > > Thanks in advance > > Regards, > > Ali Chaker
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