Re: [Xen-users] Network performance with HVM DomU

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Thu, May 19, 2016 at 07:31:27AM +0200, Christoph wrote:
> > 
> > Yes, these results all look very sensible.
> > 
> > So basically you can rule out problems with network drivers.
> > 
> > 
> > Do you happen to copy lots of small files? Is there application level
> > throttling going on?
> > 
> > (I'm afraid I'm not familiar with SMB to make sensible suggestions
> > here.)
> > 
> > Wei.
> > 
> no I copy big files 20-50GB...

Since I've been dealing with netfront issues recently also (not on Linux or 
Windows), I would recommend that you take a capture of the packets seen in 
the bridge using tcpdump and analize it with Wireshark or something 
similar. FWIW, I use the following rune in order to make tcpdump generate a 
file that I can open with Wireshark (this is all on Dom0):

# brctl show
(then you will have to identify a vif that belongs to one of the DomUs 
involved in the transaction, they have the format vif<domid>.<order>).
# tcpdump -n -i <if> -s0 -w <output>.pcap

Then you can open the resulting <output>.pcap and check for retransmissions, 
or anything strange.

Roger.

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