From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: mingo@elte.hu, pjt@google.com, efault@gmx.de, venki@google.com,
suresh.b.siddha@intel.com, linux-kernel@vger.kernel.org,
"Nikunj A. Dadhania" <nikunj@linux.vnet.ibm.com>
Subject: Re: sched: Performance of Trade workload running inside VM
Date: Wed, 15 Feb 2012 23:08:17 +0530 [thread overview]
Message-ID: <20120215173817.GD9918@linux.vnet.ibm.com> (raw)
In-Reply-To: <1329326651.2293.151.camel@twins>
* Peter Zijlstra <a.p.zijlstra@chello.nl> [2012-02-15 18:24:11]:
> On Wed, 2012-02-15 at 22:40 +0530, Srivatsa Vaddagiri wrote:
> > Ok ..let me see if these numbers highlight the problem better.
>
> does this translate like: I've no fscking clue,
I'd mentioned a possible reason earlier which is limiting VM1 to reach higher
utilization (which is the time it waits for cpu after wakeup):
>b. In the "all VMs active" case, VM1's vcpu tasks were found to incur
> "high" wait times when ttwo of VM1's tasks were scheduled on the same
> CPU (i.e a VCPU task had to wait behind a sibling VCPU task for
> obtaining CPU resource).
Let me get cpu wait time data and post it by tomorrow.
> but my tinker made it go away?
Do you have any other suggestions for me to try?
- vatsa
next prev parent reply other threads:[~2012-02-15 17:38 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-14 11:28 sched: Performance of Trade workload running inside VM Srivatsa Vaddagiri
2012-02-15 11:59 ` Peter Zijlstra
2012-02-15 17:10 ` Srivatsa Vaddagiri
2012-02-15 17:24 ` Peter Zijlstra
2012-02-15 17:38 ` Srivatsa Vaddagiri [this message]
2012-02-15 17:45 ` Peter Zijlstra
2012-02-15 17:56 ` Srivatsa Vaddagiri
2012-02-18 7:41 ` Srivatsa Vaddagiri
2012-02-20 14:56 ` Peter Zijlstra
2012-02-20 15:09 ` Srivatsa Vaddagiri
2012-02-15 17:26 ` Peter Zijlstra
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