[vbox-dev] bridged network between VMs on same host is very slow

Geoff Nordli geoffn at gnaa.net
Tue Jun 28 01:46:40 GMT 2011

>From: Geoff Nordli
>Sent: Friday, June 24, 2011 1:30 PM
>>From: Aleksey Ilyushin
>>Sent: Friday, June 24, 2011 1:06 PM
>>very slow
>>> The part I find confusing is the network speeds to other resources
>>> (besides to VMs located on the same host) is fine, if it was a
>>> Windows guest issue, wouldn't it affect all traffic?
>>VM-to-VM transfer rate, especially such low one as 16KB/s, is a
>>This is definitely unusual and host offloading settings have no effect
>it. The
>>first thing to try would be disabling offloading in the guests, it
>>somewhere in adapter properties on Windows. You may also want to enable
>>internal packet capture feature as described here
>>http://www.virtualbox.org/wiki/Network_tips , then mail the resulting
>to me
>>directly. Do not forget to disable capture afterwards.
>Thanks Aleksey.
>OK, I created the pcap file, but I noticed when I enabled nictracing
>was OK.
>As soon as I disabled nictracing performance was slow again. So I figure
>you a trace probably isn't worth it.
>Could it be something with the nictracing code?
>Any other ideas?

I upgraded to 4.0.10 today and the network is still slow.

Any ideas on why when nictracing is enabled, performance is OK?



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