Date: Tue, 31 Jan 2006 19:20:06 GMT From: "Alexander I. Mogilny" <sg@astral.ntu-kpi.kiev.ua> To: freebsd-i386@FreeBSD.org Subject: Re: i386/90641: top not show 2 CPU Message-ID: <200601311920.k0VJK61i077608@freefall.freebsd.org>
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The following reply was made to PR i386/90641; it has been noted by GNATS. From: "Alexander I. Mogilny" <sg@astral.ntu-kpi.kiev.ua> To: bug-followup@FreeBSD.org Cc: seacat@ugtel.ru Subject: Re: i386/90641: top not show 2 CPU Date: Tue, 31 Jan 2006 18:07:22 +0200 > I have never see CPU #1 work or not. > > lartnec# top > > last pid: 66813; load averages: 1.37, 1.09, 1.07 > up 23+21:36:14 11:11:37 > 161 processes: 1 running, 160 sleeping > CPU states: 23.0% user, 0.0% nice, 9.8% system, 0.0% interrupt, 67.3% idle > Mem: 206M Active, 1187M Inact, 213M Wired, 51M Cache, 112M Buf, 344M Free > Swap: 2048M Total, 2048M Free > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND > 66662 nagios 1 96 0 3260K 2728K select 0 0:00 1.08% snmpwalk > 66679 nagios 1 96 0 3260K 2728K select 0 0:00 0.81% snmpwalk > 66680 nagios 1 96 0 3260K 2728K select 0 0:00 0.81% snmpwalk > 66596 nagios 1 96 0 3260K 2728K select 0 0:00 0.75% snmpwalk > 66659 nagios 1 96 0 3260K 2728K select 0 0:00 0.66% snmpwalk > 66609 nagios 1 96 0 3260K 2728K select 0 0:00 0.56% snmpwalk > 62885 cacti 1 -8 0 15884K 15184K piperd 0 0:02 0.49% php > 66656 nagios 1 96 0 3260K 2728K select 0 0:00 0.44% snmpwalk > 66633 nagios 1 96 0 3260K 2728K select 0 0:00 0.44% snmpwalk > 66661 nagios 1 96 0 3260K 2728K select 0 0:00 0.44% snmpwalk It seem for all processes to run on one CPU: CPU#0. Try to set machdep.hyperthreading_allowed sysctl variable to 1 by following command: # sysctl machdep.hyperthreading_allowed=1. This issue seem to be expalined at http://www.freebsd.org/releases/6.0R/relnotes-i386.html <cut> Because of an information disclosure vulnerability on processors using Hyper-Threading Technology (HTT), the machdep.hyperthreading_allowed sysctl variable has been added. It defaults to 1 (HTT enabled) on FreeBSD CURRENT, and 0 (HTT disabled) on the 4-STABLE and 5-STABLE development branches and supported security fix branches. More information can be found in security advisory FreeBSD-SA-05:09.htt. </cut> -- AIM-UANIC
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