From: Tomasz Chmielewski <mangoo@wpkg.org>
To: Avi Kivity <avi@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: 0.11: SMP guests using one host CPU only?
Date: Tue, 20 Oct 2009 15:19:44 +0200 [thread overview]
Message-ID: <4ADDB8F0.5010709@wpkg.org> (raw)
In-Reply-To: <4ADDB813.5010004@redhat.com>
Avi Kivity wrote:
> On 10/20/2009 07:17 PM, Tomasz Chmielewski wrote:
>> Avi Kivity wrote:
>>> On 10/20/2009 06:03 PM, Tomasz Chmielewski wrote:
>>>> On a 8 CPU host, I created a guest with 4 CPUs (-smp 4).
>>>>
>>>> Unfortunately, the guest only uses one host CPU.
>>>> For example, running "cat /dev/urandom | gzip -9 >/dev/null &"
>>>> several times on this guest causes load on only one host CPU.
>>>>
>>>> Is it expected?
>>>
>>> No. What does 'top -H' show?
>>
>> In the guest - 4 CPUs with ~100% usage each (when I press "1"),
>> otherwise, in the task list, multiple "cat" processes taking most CPU
>> time (as it reads from /dev/urandom).
>>
>>
>> In the host - qemu-system-x86 (one process/thread) taking ~100% CPU;
>> when I press "1", I see only one CPU is used 100%, 7 other CPUs are
>> more or less not used.
>>
>
> I meant, how many qemu threads are there, and how much cpu does each take?
There is only one qemu thread for the 4-cpu guest.
--
Tomasz Chmielewski
http://wpkg.org
next prev parent reply other threads:[~2009-10-20 13:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-20 9:03 0.11: SMP guests using one host CPU only? Tomasz Chmielewski
2009-10-20 9:41 ` Avi Kivity
2009-10-20 10:17 ` Tomasz Chmielewski
2009-10-20 13:16 ` Avi Kivity
2009-10-20 13:19 ` Tomasz Chmielewski [this message]
2009-10-20 13:21 ` Avi Kivity
2009-10-20 13:48 ` Tomasz Chmielewski
2009-10-22 7:05 ` Avi Kivity
2009-10-22 9:28 ` Tomasz Chmielewski
2009-10-22 10:51 ` Avi Kivity
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