netdev - Re: [PATCH] vhost: Make it more scalable by creating a vhost thread per device.

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Date:	Thu, 08 Apr 2010 17:14:35 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Sridhar Samudrala <sri@...ibm.com>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	Tom Lendacky <toml@...ibm.com>,
	netdev <netdev@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH] vhost: Make it more scalable by creating a vhost	thread
 per device.


> Here are the results with netperf TCP_STREAM 64K guest to host on a
> 8-cpu Nehalem system.

I presume you mean 8 core Nehalem-EP, or did you mean 8 processor Nehalem-EX?

Don't get me wrong, I *like* the netperf 64K TCP_STREAM test, I lik it a lot!-) 
but I find it incomplete and also like to run things like single-instance TCP_RR 
and multiple-instance, multiple "transaction" (./configure --enable-burst) 
TCP_RR tests, particularly when concerned with "scaling" issues.

happy benchmarking,

rick jones

> It shows cumulative bandwidth in Mbps and host 
> CPU utilization.
> 
> Current default single vhost thread
> -----------------------------------
> 1 guest:  12500  37%    
> 2 guests: 12800  46%
> 3 guests: 12600  47%
> 4 guests: 12200  47%
> 5 guests: 12000  47%
> 6 guests: 11700  47%
> 7 guests: 11340  47%
> 8 guests: 11200  48%
> 
> vhost thread per cpu
> --------------------
> 1 guest:   4900 25%
> 2 guests: 10800 49%
> 3 guests: 17100 67%
> 4 guests: 20400 84%
> 5 guests: 21000 90%
> 6 guests: 22500 92%
> 7 guests: 23500 96%
> 8 guests: 24500 99%
> 
> vhost thread per guest interface
> --------------------------------
> 1 guest:  12500 37%
> 2 guests: 21000 72%
> 3 guests: 21600 79%
> 4 guests: 21600 85%
> 5 guests: 22500 89%
> 6 guests: 22800 94%
> 7 guests: 24500 98%
> 8 guests: 26400 99%
> 
> Thanks
> Sridhar
> 
> 
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