amd64/101132: Incorrect cpu idle and usage statistics in top and systat programs in SMP 6.1-STABLE/amd64

[John Baldwin]

The following reply was made to PR amd64/101132; it has been noted by GNATS.

From: John Baldwin <jhb at freebsd.org>
To: freebsd-amd64 at freebsd.org
Cc: Evgeny Larionov <AloneLion at mail.ru>, freebsd-gnats-submit at freebsd.org
Subject: Re: amd64/101132: Incorrect cpu idle and usage statistics in top and systat programs in SMP 6.1-STABLE/amd64
Date: Tue, 1 Aug 2006 13:18:56 -0400

 On Monday 31 July 2006 21:16, Evgeny Larionov wrote:
 > 
 > >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 at 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. 
 
 Try enabling hyperthreading via machdep.hyperthreading_allowed=1.
 
 -- 
 John Baldwin