Bug#154967: marked as done (glibc bug: sysconf(_SC_NPROCESSORS_CONF) mis-parses v2.4.19rc3ac3 /proc/cpuinfo)
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From: "David Luyer" <david_luyer@pacific.net.au>
To: <submit@bugs.debian.org>
Subject: glibc bug: sysconf(_SC_NPROCESSORS_CONF) mis-parses v2.4.19rc3ac3 /proc/cpuinfo
Date: Wed, 31 Jul 2002 23:32:15 +1000
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Package: libc6
Version: 2.2.5-10
The libc6 in Debian/Stable mis-parses /proc/cpuinfo from Linux kernel
v2.4.19rc3ac3 when doing a sysconf(_SC_NPROCESSORS_CONF).
This is in sysdeps/unix/sysv/linux/getsysstats.c in the
GET_NPROCS_PARSER #define.
Basically it counts both "processor" and "processor id" as CPUs, causing
it to count 4 CPUs in a 2 CPU system.
(resultant problem - procps mis-estimates Hz as 50 rather than 100 and
then gets process start times and other such things wrong in its output)
/proc/cpuinfo follows:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 11
model name : Intel(R) Pentium(R) III CPU family 1133MHz
stepping : 1
cpu MHz : 1125.856
cache size : 512 KB
processor id : 0
siblings : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 mmx fxsr sse
bogomips : 2247.88
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 11
model name : Intel(R) Pentium(R) III CPU family 1133MHz
stepping : 1
cpu MHz : 1125.856
cache size : 512 KB
processor id : 0
siblings : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 mmx fxsr sse
bogomips : 2247.88
David.
--
David Luyer Phone: +61 3 9674 7525
Network Development Manager P A C I F I C Fax: +61 3 9699 8693
Pacific Internet (Australia) I N T E R N E T Mobile: +61 4 1111 BYTE
http://www.pacific.net.au/ NASDAQ: PCNTF
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Received: (at 154967-done) by bugs.debian.org; 2 Jan 2003 06:55:25 +0000
>From gotom@debian.or.jp Thu Jan 02 00:55:25 2003
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Date: Thu, 02 Jan 2003 15:55:23 +0900
Message-ID: <80smwc59d0.wl@oris.opensource.jp>
From: GOTO Masanori <gotom@debian.or.jp>
To: 154967-done@bugs.debian.org
Subject: Re: glibc bug: sysconf(_SC_NPROCESSORS_CONF) mis-parses v2.4.19rc3ac3 /proc/cpuinfo
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> The libc6 in Debian/Stable mis-parses /proc/cpuinfo from Linux kernel
> v2.4.19rc3ac3 when doing a sysconf(_SC_NPROCESSORS_CONF).
>
> This is in sysdeps/unix/sysv/linux/getsysstats.c in the
> GET_NPROCS_PARSER #define.
>
> Basically it counts both "processor" and "processor id" as CPUs, causing
> it to count 4 CPUs in a 2 CPU system.
>
> (resultant problem - procps mis-estimates Hz as 50 rather than 100 and
> then gets process start times and other such things wrong in its output)
>
> /proc/cpuinfo follows:
>
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 11
> model name : Intel(R) Pentium(R) III CPU family 1133MHz
> stepping : 1
> cpu MHz : 1125.856
> cache size : 512 KB
> processor id : 0
It's kernel side problem, the current kernel says "physical id".
seq_printf(m, "physical id\t: %d\n",phys_proc_id[n]);
Upgrade your kernel. I close this bug.
Regards,
-- gotom
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