[AusNOG] VM throughput to network

[Craig Meyers]

I thought I might add a bit on this.
 
I've done a number of investigations recently on performance involving
TCP/IP and VMs.
 
Generally, I've found the access methodology is the least of your
worries. :)
 
The main culprit being 'old faithful':
 TCP performance = TCP window/latency
 
I've seen a couple of cases of added latency of virtualisation. One case
where we did a packet cap in the VM, vs a packet cap vs a mirror'd port
closest to the physical host and there was a 6ms latency differential.
Where the rest of the path is sub 1ms latency, 6ms added latency is a
non-trivial hit to performance.
 
 
 

 

Craig Meyers

Senior Data Communications Engineer

Network Services

 

317 Edward Street 

BRISBANE QLD 4000

 

Ph:          (07) 323 90283 

Mob:       0408 452 884

Email:     craig.meyers at citec.com.au

 

   www.citec.com.au <http://www.citec.com.au/> 

 

"Tomorrow's Queensland: strong, green, smart, healthy and fair - 
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________________________________

From: ausnog-bounces at lists.ausnog.net
[mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Bruce Renner
Sent: Thursday, 18 November 2010 1:23 PM
To: Jay Mitchell
Cc: ausnog
Subject: Re: [AusNOG] VM throughput to network


A quick google search revealed this. 

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd
=displayKC&externalId=1004048

<http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cm
d=displayKC&externalId=1004048> The short answer is yes, ESX can use 2
or more nics to improve throughput.

Cheers All, Bruce



On Thu, Nov 18, 2010 at 12:44 PM, Jay Mitchell <jay at miscreant.org>
wrote:


	It's configurable at the VMWare side also:

	 

	-        Route based on the originating virtual port ID

	-        Route based in IP hash 

	-        Route based on source MAC hash

	-        Use explicit failover order

	 

	--Jay

	 

	From: ausnog-bounces at lists.ausnog.net [mailto:
ausnog-bounces at lists.ausnog.net] On Behalf Of Daniel Thoroughgood
	Sent: Thursday, 18 November 2010 11:12 AM
	To: ausnog
	Subject: Re: [AusNOG] VM throughput to network

	 

	I believe ESX  load-balances outbound traffic based upon
destination MAC address.  If traffic is mostly going to a default
gateway, or a storage device, then it's unlikely to be moved over more
than one link.

	 

	Incoming traffic depends on the switch.


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-- 
Bruce Renner
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