Date: Tue, 1 Aug 2006 01:16:05 GMT From: Evgeny Larionov <AloneLion@mail.ru> To: freebsd-gnats-submit@FreeBSD.org Subject: amd64/101132: Incorrect cpu idle and usage statistics in top and systat programs in SMP 6.1-STABLE/amd64 Message-ID: <200608010116.k711G5QU033399@www.freebsd.org> Resent-Message-ID: <200608010120.k711KE8T032105@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
>Number: 101132
>Category: amd64
>Synopsis: Incorrect cpu idle and usage statistics in top and systat programs in SMP 6.1-STABLE/amd64
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-amd64
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Aug 01 01:20:14 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator: Evgeny Larionov
>Release: 6.1-STABLE
>Organization:
Comlink
>Environment:
FreeBSD test.comlink.khakassia.ru 6.1-STABLE FreeBSD 6.1-STABLE #1: Sat Jul 29 19:18:29 KRAST 2006 lion@test.comlink.khakassia.ru:/usr/obj/usr/src/sys/HOSTING amd64
>Description:
systat -v and top show incorrect information in SMP 6.1-STABLE under amd64.
When run two program with 100% cpu alocation (using only calculation without idle) on processor with HTT (2 logical processors) top and systat show only not more 50% cpu usage with 50% idle.
top:
last pid: 52141; load averages: 1.92, 0.95, 0.40 up 2+14:13:23 09:00:47
71 processes: 3 running, 68 sleeping
CPU states: 46.4% user, 0.0% nice, 0.0% system, 3.6% interrupt, 50.0% idle
Mem: 101M Active, 205M Inact, 106M Wired, 15M Cache, 59M Buf, 2796K Free
Swap: 1500M Total, 204K Used, 1500M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
52122 root 1 113 0 2412K 644K RUN 0 1:47 49.07% horse
52124 root 1 112 0 2412K 644K RUN 0 1:34 48.88% horse
systat -v:
0.1%Sys 0.0%Intr 49.9%User 0.0%Nice 50.0%Idl 210568 inact 1 19: uhc
| | | | | | | | | | 15856 cache 1 27: em0
>How-To-Repeat:
show top or systat -v utilities in FreeBSD 6.1-STABLE amd64 with SMP kernel during high cpu load (two or more runnig programms using only calculation without idle, looped C code for example) and you can see always 50% CPU usage, not more.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
>>>>>>>>>>>>>>>>>>>>>>>>> 2576 free 3 48: twa
daefr 2000 cpu0: time
Namei Name-cache Dir-cache prcfr 2000 cpu1: time
Calls hits % hits % react
dmesg.boot:
Copyright (c) 1992-2006 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD 6.1-STABLE #1: Sat Jul 29 19:18:29 KRAST 2006
lion@test.comlink.khakassia.ru:/usr/obj/usr/src/sys/HOSTING
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (2992.52-MHz K8-class CPU)
Origin = "GenuineIntel" Id = 0xf41 Stepping = 1
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x641d<SSE3,RSVD2,MON,DS_CPL,CNTX-ID,CX16,<b14>>
AMD Features=0x20000800<SYSCALL,LM>
Logical CPUs per core: 2
real memory = 528371712 (503 MB)
avail memory = 502108160 (478 MB)
ACPI APIC Table: <A M I OEMAPIC >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ioapic1 <Version 2.0> irqs 24-47 on motherboard
ioapic2 <Version 2.0> irqs 48-71 on motherboard
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200608010116.k711G5QU033399>