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List: qemu-discuss
Subject: [Qemu-discuss] cpu socket/cores/threads nor extra flags not showing up in guest's cpuinfo
From: "Nelson, Bjorn" <Bjorn.Nelson () morganstanley ! com>
Date: 2012-03-27 17:57:34
Message-ID: A65DF704A866CE43A176E00CE9D5520CE13C64CD92 () NYWEXMBX2124 ! msad ! ms ! com
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Hi,
I am trying to use the -smp option to setup a couple different layouts for the cpu \
but am finding that it doesn't respect them. I can either go all cpus or all cores, \
but not some mix of the two.
`> /ms/dist/fsf/PROJ/qemu/1.0/bin/qemu-system-x86_64 -version
QEMU emulator version 1.0, Copyright (c) 2003-2008 Fabrice Bellard
-smp cores=4,sockets=2,threads=1
-smp cores=2,sockets=2,threads=2
Results in /proc/cpuinfo output showing for all physical id: 0 but cores: 1 and \
siblings: 8
-smp 8
Results in /proc/cpuinfo output showing 8 with different physical ids which makes \
sense.
This is with version qemu 1.0 with cpu qemu64. Also, for some reason using -cpu \
qemu64,+sse3,+sse4.1,+sse4.2, didn't enable these cpu flags in the guest either. I \
get the same behavior with -cpu Nehalem (which is the underlying hardware).
I tried setting different -numa ids to see if that would help trigger something, but \
it didn't help. Also I tried this with the kvm binary version 0.12.1 where it seemed \
to work. My guess is there isn't much performance different between all cpus and all \
cores under a vm, but if someone can confirm that, I would appreciate it.
-Bjorn
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SIZE="3"><FONT FACE="Arial" SIZE="1"><FONT SIZE="2"><div class=WordSection1><p \
class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p \
class=MsoNormal>I am trying to use the -smp option to setup a couple different \
layouts for the cpu but am finding that it doesn’t respect them. I can \
either go all cpus or all cores, but not some mix of the two. <o:p></o:p></p><p \
class=MsoNormal><o:p> </o:p></p><p class=MsoNormal \
style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Courier \
New"'>`> /ms/dist/fsf/PROJ/qemu/1.0/bin/qemu-system-x86_64 -version<span \
style='color:black;background:black;mso-highlight:black'><o:p></o:p></span></span></p><p \
class=MsoNormal style='text-autospace:none'><span \
style='font-size:10.0pt;font-family:"Courier New"'>QEMU emulator version 1.0, \
Copyright (c) 2003-2008 Fabrice Bellard<span \
style='color:black;background:black;mso-highlight:black'><o:p></o:p></span></span></p><p \
class=MsoNormal>-smp cores=4,sockets=2,threads=1<o:p></o:p></p><p \
class=MsoNormal>-smp cores=2,sockets=2,threads=2<o:p></o:p></p><p \
class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Results in /proc/cpuinfo \
output showing for all physical id: 0 but cores: 1 and siblings: 8<o:p></o:p></p><p \
class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>-smp 8<o:p></o:p></p><p \
class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Results in /proc/cpuinfo \
output showing 8 with different physical ids which makes sense.<o:p></o:p></p><p \
class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>This is with version qemu 1.0 \
with cpu qemu64. Also, for some reason using <span \
style='font-size:10.0pt;font-family:"Courier New"'>-</span>cpu \
qemu64,+sse3,+sse4.1,+sse4.2, didn’t enable these cpu flags in the guest \
either. I get the same behavior with -cpu Nehalem (which is the underlying \
hardware). <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p \
class=MsoNormal>I tried setting different -numa ids to see if that would help trigger \
something, but it didn’t help. Also I tried this with the kvm binary \
version 0.12.1 where it seemed to work. My guess is there isn’t much \
performance different between all cpus and all cores under a vm, but if someone can \
confirm that, I would appreciate it. <o:p></o:p></p><p \
class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span \
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>-Bjorn</span><span \
style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>   \
;</span><o:p></o:p></p></div></FONT></FONT></FONT></FONT></SPAN></FONT></SPAN></DIV> \
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