* KVM: x86: increase recommended max vcpus to 160
@ 2012-02-03 14:28 Marcelo Tosatti
2012-02-03 15:28 ` Sasha Levin
0 siblings, 1 reply; 4+ messages in thread
From: Marcelo Tosatti @ 2012-02-03 14:28 UTC (permalink / raw)
To: kvm
Increase recommended max vcpus from 64 to 160 (tested internally
at Red Hat).
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 4610166..782d973 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -29,7 +29,7 @@
#include <asm/msr-index.h>
#define KVM_MAX_VCPUS 254
-#define KVM_SOFT_MAX_VCPUS 64
+#define KVM_SOFT_MAX_VCPUS 160
#define KVM_MEMORY_SLOTS 32
/* memory slots that does not exposed to userspace */
#define KVM_PRIVATE_MEM_SLOTS 4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: KVM: x86: increase recommended max vcpus to 160
2012-02-03 14:28 KVM: x86: increase recommended max vcpus to 160 Marcelo Tosatti
@ 2012-02-03 15:28 ` Sasha Levin
2012-02-03 15:55 ` Marcelo Tosatti
0 siblings, 1 reply; 4+ messages in thread
From: Sasha Levin @ 2012-02-03 15:28 UTC (permalink / raw)
To: Marcelo Tosatti; +Cc: kvm
On Fri, 2012-02-03 at 12:28 -0200, Marcelo Tosatti wrote:
> Increase recommended max vcpus from 64 to 160 (tested internally
> at Red Hat).
>
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Awesome!
Would it be possible to share the benchmarks?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: KVM: x86: increase recommended max vcpus to 160
2012-02-03 15:28 ` Sasha Levin
@ 2012-02-03 15:55 ` Marcelo Tosatti
2012-02-03 20:32 ` shak
0 siblings, 1 reply; 4+ messages in thread
From: Marcelo Tosatti @ 2012-02-03 15:55 UTC (permalink / raw)
To: Sasha Levin; +Cc: kvm, shak
On Fri, Feb 03, 2012 at 10:28:57AM -0500, Sasha Levin wrote:
> On Fri, 2012-02-03 at 12:28 -0200, Marcelo Tosatti wrote:
> > Increase recommended max vcpus from 64 to 160 (tested internally
> > at Red Hat).
> >
> > Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
>
> Awesome!
>
> Would it be possible to share the benchmarks?
Not sure. Shak?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: KVM: x86: increase recommended max vcpus to 160
2012-02-03 15:55 ` Marcelo Tosatti
@ 2012-02-03 20:32 ` shak
0 siblings, 0 replies; 4+ messages in thread
From: shak @ 2012-02-03 20:32 UTC (permalink / raw)
To: Marcelo Tosatti; +Cc: Sasha Levin, kvm, Douglas Shakshober
On 02/03/2012 10:55 AM, Marcelo Tosatti wrote:
> On Fri, Feb 03, 2012 at 10:28:57AM -0500, Sasha Levin wrote:
>
>> On Fri, 2012-02-03 at 12:28 -0200, Marcelo Tosatti wrote:
>>
>>> Increase recommended max vcpus from 64 to 160 (tested internally
>>> at Red Hat).
>>>
>>> Signed-off-by: Marcelo Tosatti<mtosatti@redhat.com>
>>>
>> Awesome!
>>
>> Would it be possible to share the benchmarks?
>>
> Not sure. Shak?
>
>
We have been using Linpack NxN but always hit a HW barriers even on bare
metal
http://software.intel.com/en-us/articles/running-the-hpl-benchmark-over-intel-mpi/?wapkw=(LINPACK+MPI)
http://software.intel.com/en-us/articles/intel-math-kernel-library-linpack-download
Shak
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-02-03 20:32 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-02-03 14:28 KVM: x86: increase recommended max vcpus to 160 Marcelo Tosatti
2012-02-03 15:28 ` Sasha Levin
2012-02-03 15:55 ` Marcelo Tosatti
2012-02-03 20:32 ` shak
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox