Re: [Xen-users] Re: My domU cpuinfo shows "cache seize: 16KB" ater upgrading to Xen-3.3.0... but in Xen-3.2 it has 2048KB!

["Thiago Camargo Martins Cordeiro" <thiagocmartinsc@xxxxxxxxx>]

I just download xen-3.3.0 and do: make world;make install. After that, I have configured modules, initramdisk, Grub, has I do in the xen-3.2.0, and yes, I have mercurial and all build-deps installed... I can't see why my domU is showing only 16KB and my dom0 shows 2048KB... I'm just using the Xen defaults for Kernel and Hypervisor.

2008/9/22 Dustin Henning <Dustin.Henning@xxxxxxxxxxx>

      I haven't tried Xen 3.3.0, as I stick with the F8 repo Xen since it
is working.  However, have you tried a different kernel?  Perhaps yours
needs recompiled to detect the greater processor cache.  I really don't
know, so I'm not going to say it couldn't be Xen, but I do know that there
are a lot of processor options when you compile a kernel.  What I don't know
is which differences those processor options make.
       Dustin

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Thiago Camargo
Martins Cordeiro
Sent: Friday, September 19, 2008 22:57
To: xen-users
Subject: [Xen-users] Re: My domU cpuinfo shows "cache seize: 16KB" ater
upgrading to Xen-3.3.0... but in Xen-3.2 it has 2048KB!

No one knows about this?!
It's normal for domU in Xen-3.3 to have only 16KB of CPU cache size?

Thanks!
Thiagi
2008/9/18 Thiago Camargo Martins Cordeiro <thiagocmartinsc@xxxxxxxxx>
Hi folks!

 After upgrading my Xen-3.2.0 to new Xen-3.3.0/Linux-2.6.18.8-xen-3.3.0 my
domU /proc/cpuinfo shows only:

administrativo@vsrvXX:~$ cat /proc/cpuinfo
processor    : 0
vendor_id    : GenuineIntel
cpu family    : 15
model        : 6
model name    :               Intel(R) Pentium(R) D CPU 3.40GHz
stepping    : 4
cpu MHz        : 3391.500
cache size    : 16 KB
physical id    : 0
siblings    : 1
core id        : 0
cpu cores    : 1
fpu        : yes
fpu_exception    : yes
cpuid level    : 6
wp        : yes
flags        : fpu de tsc msr pae cx8 apic sep cmov pat clflush acpi mmx
fxsr sse sse2 ss ht syscall nx lm constant_tsc pni cid cx16 lahf_lm
bogomips    : 6785.83
clflush size    : 64
cache_alignment    : 128
address sizes    : 36 bits physical, 48 bits virtual
power management:

 But before upgrade, it's cache was the same of my dom0, look my dom0
cpuinfo:

root@hyper02:~# cat /proc/cpuinfo
processor    : 0
vendor_id    : GenuineIntel
cpu family    : 15
model        : 6
model name    :               Intel(R) Pentium(R) D CPU 3.40GHz
stepping    : 4
cpu MHz        : 3391.498
cache size    : 2048 KB
physical id    : 0
siblings    : 1
core id        : 0
cpu cores    : 1
fpu        : yes
fpu_exception    : yes
cpuid level    : 6
wp        : yes
flags        : fpu de tsc msr pae cx8 apic sep mtrr cmov pat clflush acpi
mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc up pni est cid cx16
lahf_lm
bogomips    : 6785.50
clflush size    : 64
cache_alignment    : 128
address sizes    : 36 bits physical, 48 bits virtual
power management:

How to give more cpu cache to my domU in new Xen-3.3.0? My domUs are very
slow now!
I do not use HVM, all my Linux domUs are paravirtualized.

Thanks!
Thiago

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