linux-kernel - Re: sched: Performance of Trade workload running inside VM

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Message-ID: <20120215173817.GD9918@linux.vnet.ibm.com>
Date:	Wed, 15 Feb 2012 23:08:17 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	mingo@...e.hu, pjt@...gle.com, efault@....de, venki@...gle.com,
	suresh.b.siddha@...el.com, linux-kernel@...r.kernel.org,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>
Subject: Re: sched: Performance of Trade workload running inside VM

* Peter Zijlstra <a.p.zijlstra@...llo.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

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