[WBEL-users] Re: Hyperthreading not enabled in WB kernels?
Vincent.Raffensberger@dtn.com
Vincent.Raffensberger@dtn.com
Wed, 28 Apr 2004 21:19:16 -0500
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Both SMP and ACPI HT need to be enabled. I just checked the i686-smp
default config in the kernel source and it's not configured there.
I wonder why it was turned off and if it's the same way on the RH kernel.
If it were, I'd expect to see plenty of posts about it when searching...
There "shouldn't" be any harm in enabling it and once enabled, you can
disable it with an append statement.
I guess I'll just need to remember to build my own kernels if we end up
using WB.
Thanks.
Keith Morse <kgmorse@mpcu.com>
Sent by: whitebox-users-admin@beau.org
04/28/2004 05:53 PM
To
Vincent.Raffensberger@dtn.com
cc
whitebox-users@beau.org
Subject
[WBEL-users] Re: Hyperthreading not enabled in WB kernels?
On Wed, 28 Apr 2004 Vincent.Raffensberger@dtn.com wrote:
> While testing whitebox I noticed that hyperthreading doesn't appear to
be
> enabled in the kernel.
> This system is a dual Xeon with HT enabled and showing in the BIOS.
> This same box has run RH8.0 and Fedora Core1 and they both showed four
> "processors" and "siblings: 2" in /proc/cpuinfo.
> As recommended elsewhere, I tried appending "apcismp=force" to the
kernel,
> but that didn't change anything.
>
> Are there any other users seeing the same type of thing?
>
> Here's some relevant info from the system:
> [root@wbel3 root]# uname -a
> Linux wbel3 2.4.21-9.0.3.ELsmp #1 SMP Sat Apr 24 21:45:44 EDT 2004 i686
^^^
^^^
I think the key here is that you are using a SMP kernel. IIRC that is how
the HT part is enabled.
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<br><font size=2 face="sans-serif">Both SMP and ACPI HT need to be enabled.
I just checked the i686-smp default config in the kernel source and
it's not configured there. </font>
<br><font size=2 face="sans-serif">I wonder why it was turned off and if
it's the same way on the RH kernel. If it were, I'd expect to see
plenty of posts about it when searching...</font>
<br><font size=2 face="sans-serif">There "shouldn't" be any harm
in enabling it and once enabled, you can disable it with an append statement.</font>
<br>
<br><font size=2 face="sans-serif">I guess I'll just need to remember to
build my own kernels if we end up using WB.</font>
<br>
<br><font size=2 face="sans-serif">Thanks.</font>
<br>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td width=40%><font size=1 face="sans-serif"><b>Keith Morse <kgmorse@mpcu.com></b>
</font>
<br><font size=1 face="sans-serif">Sent by: whitebox-users-admin@beau.org</font>
<p><font size=1 face="sans-serif">04/28/2004 05:53 PM</font>
<td width=59%>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td valign=top><font size=1 face="sans-serif">Vincent.Raffensberger@dtn.com</font>
<tr>
<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
<td valign=top><font size=1 face="sans-serif">whitebox-users@beau.org</font>
<tr>
<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td valign=top><font size=1 face="sans-serif">[WBEL-users] Re: Hyperthreading
not enabled in WB kernels?</font></table>
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<td>
<td></table>
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<br><font size=2><tt>On Wed, 28 Apr 2004 Vincent.Raffensberger@dtn.com
wrote:<br>
<br>
> While testing whitebox I noticed that hyperthreading doesn't appear
to be <br>
> enabled in the kernel. <br>
> This system is a dual Xeon with HT enabled and showing in the BIOS.<br>
> This same box has run RH8.0 and Fedora Core1 and they both showed
four <br>
> "processors" and "siblings: 2" in /proc/cpuinfo.<br>
> As recommended elsewhere, I tried appending "apcismp=force"
to the kernel, <br>
> but that didn't change anything.<br>
> <br>
> Are there any other users seeing the same type of thing?<br>
> <br>
> Here's some relevant info from the system:<br>
> [root@wbel3 root]# uname -a<br>
> Linux wbel3 2.4.21-9.0.3.ELsmp #1 SMP Sat Apr 24 21:45:44 EDT 2004
i686 <br>
^^^<br>
^^^<br>
I think the key here is that you are using a SMP kernel. IIRC that
is how <br>
the HT part is enabled.<br>
<br>
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</tt></font>
<br>
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