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Bug#496850: marked as done (linux-image-2.6.18-6-486: bogomips reduced from 100 to 20 after package upgrade)



Your message dated Sat, 14 Apr 2012 17:58:59 +0100
with message-id <1334422739.7150.450.camel@deadeye>
and subject line Re: linux-image-2.6.18-6-486: bogomips reduced from 100 to 20 after package upgrade
has caused the Debian Bug report #496850,
regarding linux-image-2.6.18-6-486: bogomips reduced from 100 to 20 after package upgrade
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
496850: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496850
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message ---
Package: linux-image-2.6.18-6-486
Version: 2.6.18.dfsg.1-22etch2
Severity: minor


I think this is minor, but it caught my attention and I thought the
package maintainer might want to know about it. Upgrading this
package from 2.6.18.dfsg.1-22 to 2.6.18.dfsg.1-22etch2 caused the
bogomips benchmark to drop from 99.07 to 20.03 on a Vortex86SX
based computer.

Downgrading this package back to 2.6.18.dfsg-1-22 (using
"apt-get install linux-image-2.6.18-6-486=2.6.18.dfsg.1-22"),
and changing nothing else, restored the bogomips rating back to 99.07.

I do not know if the computer actually ran slower. I didn't notice
a difference while using it, it was just the bogomips number that
caught my attention. If additional testing would be helpful, please
suggest something that would run on a minimal (command-line only) Etch
installation.

The computer is an Ebox 2300SX, which is a tiny x86 computer that 
contains a Vortex86SX processor running at 300MHz. (More CPU info at 
http://www.dmp.com.tw/tech/vortex86sx/)
I installed Debian Etch 4.0.r4 which came with version 
2.6.18.dfsg.1-22 of the package linux-image-2.6.18-6-486. During 
startup, the computer reported 99.07 BogoMIPS which was in line
with other reported ratings (i.e. 1/3 the processor clock).

After the installation, I added security.debian.org to
/etc/apt/sources.list and used apt-get to upgrade the installed
packages. According to the time stamps of the installed files
and the log files, it was the next reboot that showed the 
reduced BogoMIPS.
 
Here is /proc/cpuinfo with the rolled back (2.6.18.dfsg.1-22)
version of linux-images:

processor       : 0
vendor_id       : unknown
cpu family      : 4
model           : 0
model name      : 486
stepping        : unknown
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : no
fpu_exception   : no
cpuid level     : -1
wp              : yes
flags           :
bogomips        : 99.07

Thanks and best regards,
Kevin

-- System Information:
Debian Release: 4.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i486)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-6-486
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)



--- End Message ---
--- Begin Message ---
Version: 2.6.18.dfsg.1-24

Belatedly marking this as fixed, based on your follow-up.

Ben.

-- 
Ben Hutchings
It is easier to change the specification to fit the program than vice versa.

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