network bug in xen 4.5?

network bug in xen 4.5?

[jacek burghardt]

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I believe there is a bug in networking under xen 4.5. When I copy files
between pv and hvm on same bridge I get 80 mb/s download speed. When I copy
same file from pv to hvm on another server running same xen version I only
get 1 to 3 mb/s speed. I have 6tb of data that I had copied to server with
dual quad xeon cpus and trying to copy the files back to my server and wit
that slow speed it will take days to do it

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Re: network bug in xen 4.5?

[Jan Beulich]

>>> On 10.04.14 at 04:26, <jaceksburghardt@gmail.com> wrote:
> I believe there is a bug in networking under xen 4.5. When I copy files
> between pv and hvm on same bridge I get 80 mb/s download speed. When I copy
> same file from pv to hvm on another server running same xen version I only
> get 1 to 3 mb/s speed. I have 6tb of data that I had copied to server with
> dual quad xeon cpus and trying to copy the files back to my server and wit
> that slow speed it will take days to do it

And this is only on Xen 4.5, i.e. only dependent on hypervisor/tools
version? I ask because networking performance is usually much more
affected by elements not under direct Xen control (Dom0 kernel,
guest kernel, other infrastructure).

Jan

Re: network bug in xen 4.5?

[Wei Liu]

On Wed, Apr 09, 2014 at 08:26:16PM -0600, jacek burghardt wrote:
> I believe there is a bug in networking under xen 4.5. When I copy files

Xen 4.5 is not out yet.

> between pv and hvm on same bridge I get 80 mb/s download speed. When I copy
> same file from pv to hvm on another server running same xen version I only
> get 1 to 3 mb/s speed. I have 6tb of data that I had copied to server with
> dual quad xeon cpus and trying to copy the files back to my server and wit
> that slow speed it will take days to do it

This looks like a hardware driver issue to me. The speed for copying
between VMs on the same host looks normal. 80 is probably the speed
limit of your disk. What number can you get if you copy file from Dom0
to remote host?

Wei.

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Re: network bug in xen 4.5?

[jacek burghardt]

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Thank for the info. I moved my server 2012 R2 to different bridge and I am
getting  67 mb/s downloading data back to my new raid. I will check my
bridge config network cable.


On Thu, Apr 10, 2014 at 2:39 AM, Wei Liu <wei.liu2@citrix.com> wrote:

> On Wed, Apr 09, 2014 at 08:26:16PM -0600, jacek burghardt wrote:
> > I believe there is a bug in networking under xen 4.5. When I copy files
>
> Xen 4.5 is not out yet.
>
> > between pv and hvm on same bridge I get 80 mb/s download speed. When I
> copy
> > same file from pv to hvm on another server running same xen version I
> only
> > get 1 to 3 mb/s speed. I have 6tb of data that I had copied to server
> with
> > dual quad xeon cpus and trying to copy the files back to my server and
> wit
> > that slow speed it will take days to do it
>
> This looks like a hardware driver issue to me. The speed for copying
> between VMs on the same host looks normal. 80 is probably the speed
> limit of your disk. What number can you get if you copy file from Dom0
> to remote host?
>
> Wei.
>
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xen.org
> > http://lists.xen.org/xen-devel
>
>

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