[opensuse] New way to thoroughly check for network bottlenecks and simulating a network load
List, For those that dream of a good tool to generate sufficient network I/O for testing routing, etc.. Take one or two of your Linux boxes containing VirtualBox (Linux host/XP or Vista guest) Forward X via ssh from a remote computer at the office that has the XP or Vista guest and then from an xterm type "VirtualBox" then hit the Start button on the VB console. Works great and will provide a sustained load on the internal subnet as the guest (now on your box via ssh) goes through the boot process that appears to be somewhat I/O intensive for the windows guest. 45min and I'm still waiting to get a usable task bar, Best part about the setup -- FREE :p -- David C. Rankin, J.D.,P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Sat, 2009-10-03 at 03:43 -0500, David C. Rankin wrote:
List,
For those that dream of a good tool to generate sufficient network I/O for testing routing, etc.. Take one or two of your Linux boxes containing VirtualBox (Linux host/XP or Vista guest) Forward X via ssh from a remote computer at the office that has the XP or Vista guest and then from an xterm type "VirtualBox" then hit the Start button on the VB console. Works great and will provide a sustained load on the internal subnet as the guest (now on your box via ssh) goes through the boot process that appears to be somewhat I/O intensive for the windows guest. 45min and I'm still waiting to get a usable task bar, Best part about the setup -- FREE :p
Funny you should mention this. Just last night I just did a ssh to a Linux box from a linux box, going through a third linux box to make the connection. I ran VMware remotely, starting a Windows XP OS. I was surprised how snappy it was. I expected what you saw, but in fact got a very usable session. So, I think part of your problem is how your parts are connected. I suspect a bottleneck more than a general flaw in the idea. I think the slowest ethernet interface in my setup is my broadband connection at home (the ultimate destination of the VMWare/X session). Perhaps one of your machines has too little RAM? -- Roger Oberholtzer -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Saturday 03 October 2009 05:46:19 am Roger Oberholtzer wrote:
Funny you should mention this. Just last night I just did a ssh to a Linux box from a linux box, going through a third linux box to make the connection. I ran VMware remotely, starting a Windows XP OS. I was surprised how snappy it was. I expected what you saw, but in fact got a very usable session.
So, I think part of your problem is how your parts are connected. I suspect a bottleneck more than a general flaw in the idea. I think the slowest ethernet interface in my setup is my broadband connection at home (the ultimate destination of the VMWare/X session). Perhaps one of your machines has too little RAM?
Roger, Now you did it :-) You got me thinking... None of the boxes are short on ram (4G on the box at the office I was sshed into [784M allocated to the XP VM] and 4G on my laptop [the box doing the sshing]). Where I live the broadband market is monopolized by suddenlink (the old cox internet) and you pay a premium for 1M down and 384K up. So the ssh connection (and VirtualBox with the XP client) in both directions was limited to 384 send. When I had konsole open and started vb the vb-console popped right up. Then when I kicked off the XP client, performance tanked. Literally 45 minutes later, I was still waiting to get a fully loaded XP. Now the XP client works fine on the office machine when I'm there locally, better than if I have booted XP natively. However starting it with X forwarded killed it. Not really thinking about it, I just jokingly capped off the email about the bottleneck, but now that you brought it up, I can't see why it didn't work better than it did. All the work should have been done on the office box with just the display forwarded to my laptop. But what I saw looked like I had launched vb on my laptop and then chose the VM that existed on the office box and said go requiring a 20G transfer to load the virtual machine. Anybody got any idea why vb performance tanked when run over ssh with forwarded X? -- David C. Rankin, J.D.,P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
participants (2)
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David C. Rankin
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Roger Oberholtzer