Date: Tue, 20 Sep 2011 20:27:16 +0000 (UTC) From: Anton Yuzhaninov <citrin@citrin.ru> To: freebsd-performance@freebsd.org Subject: Re: hwpmc overflow Message-ID: <j5asv4$p7e$1@dough.gmane.org> References: <j5ae29$e6g$1@dough.gmane.org>
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On Tue, 20 Sep 2011 16:12:57 +0000 (UTC), Anton Yuzhaninov wrote: AY> pmcstat -C -w1 -d -p AY> INSTR_RETIRED_ANY -p DTLB_MISSES.ANY -p MEM_LOAD_RETIRED.DTLB_MISS -p AY> ITLB_MISSES.ANY -p MEM_LOAD_RETIRED.L3_MISS AY> AY> With -C values should monotonous increase, but in output I see AY> overflous. AY> AY> Example output: AY> http://pastebin.com/JiEF9AcU AY> AY> 2120463169 AY> 2139646836 AY> 281472837488169 AY> 281472855479093 AY> AY> 2139646836 is near to 2^31 - max value for signed int (int32_t) AY> Some more debug info: # uname -a FreeBSD test.vega.ru 8.2-STABLE FreeBSD 8.2-STABLE #0: Tue Sep 20 14:41:45 UTC 2011 root@example.ru:/usr/obj/usr/src/sys/GENERIC amd64 hwpmc: TSC/1/64/0x20<REA> IAP/4/48/0x3ff<INT,USR,SYS,EDG,THR,REA,WRI,INV,QUA,PRC> IAF/3/48/0x61<INT,REA,WRI> UCP/8/48/0x3f8<EDG,THR,REA,WRI,INV,QUA,PRC> UCF/1/48/0x60<REA,WRI> kern.hwpmc.debugflags: pmc=ops When in pmc out shown values 2111155514 281473102541203 in dmesg I can see PMC:OPS:2: rw id=4 -> old 7dd5ad3 PMC:OPS:2: rw id=4 -> old ffff904a7193 So probmles somewhere in kernel (not in pmcstat) -- Anton Yuzhaninov
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