Re: [Xen-users] Slow upstream speeds from guest OS

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Feb 16, 2016 at 07:34:40AM -0700, Steffan Cline wrote:
> Yes, that is installed. What else can I check?
>

The network data path for your VM is like

   frontend in guest -> backend in Dom0 -> Dom0 network stack ->
   Physical nic

You can run iperf -s in Dom0 and iperf -c in DomU to make sure the
data path is not throttled in that segment. Then you can check if Dom0
is applying any other restrictions -- this I can't help you with, but
start with normal network diagnose tools.

Wei.


> [root@xxx ~]# lsmod | grep netfront
> xen_netfront           18083  0 
> 
> 
> 
> Thank you,
> Steffan Cline
> 602-793-0014
> 
> 
> 
> 
> 
> 
> 
> 
> On 2/16/16, 4:07 AM, "Wei Liu" <xen-users-bounces@xxxxxxxxxxxxx on behalf of 
> wei.liu2@xxxxxxxxxx> wrote:
> 
> >On Mon, Feb 15, 2016 at 06:08:19PM -0700, Steffan Cline wrote:
> >> Running into an odd thing and not sure where to look.
> >> 
> >> When I log into my CentOS 6 host OS and use the speediest-cli tool 
> >> (https://github.com/sivel/speedtest-cli) I can get 20mbps up.
> >> 
> >> When I log into my CentOS 6 guest OS and use the same tool, I can only get 
> >> about 2.5-5mbps up.
> >> 
> >> Any suggestions as to where to look for the cause of this horrid upstream?
> >> 
> >> Download speeds are only off by about 2mbps.
> >> 
> >> In the .cfg files, there are no limits imposed anywhere.
> >>
> >
> >Please make sure your guest has PV network driver installed and
> >activated.
> >
> >You can probably check that by "lsmod | grep netfront", provided the
> >driver is compiled as module (which most distros do).
> >
> >Wei.
> >
> >> 
> >> Thank you,
> >> Steffan Cline
> >> 602-793-0014
> >> 
> >> 
> >
> >> _______________________________________________
> >> Xen-users mailing list
> >> Xen-users@xxxxxxxxxxxxx
> >> http://lists.xen.org/xen-users
> >
> >
> >_______________________________________________
> >Xen-users mailing list
> >Xen-users@xxxxxxxxxxxxx
> >http://lists.xen.org/xen-users
> >
> 

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