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Hyper-V: Very slow network (latency) on virtual Win XP clients?

Source: microsoft.public.virtualserver
Sent: 09/23/2008
From: "Peter D. Jørgensen" <(email address - cut out)>
Message:

Virtual Host: Windows 2008 x64 with Hyper-V RC1, 1x1gb/s NIC, 16 gb ram

Virtual Machine: Windows XP pro SP2 - 2 gb ram

I'm simply testing "ping -t -l 64000 <servername>" from a virtual client and
I get an average of 10 ms. From ordinary workstations (and the virtual host)
I get between 1 and 2 ms. I have also tried with legacy network drivers, but
they are even worse with 25ms.

Isn't it possible to get similar performance from a virtual Windows XP under
Hyper-V as from ordinary workstations?

Is this normal behaviour of all virtualization software or is it a known
Hyper-V "issue"?

Thanks in advance

Peter

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Related Messages

Re: Hyper-V: Very slow network (latency) on virtual Win XP clients?

Sent: 09/23/2008
From: "Ryan Sokolowski [MVP]" <(email address - cut out)>
Message:

Just as a note - during a software development cycle, most performance
optimization isn't done until the RTM build of a release. Have you tried
the full RTM version of Hyper-V to compare your results?

--
Ryan Sokolowski
MVP - Clustering
MCT, MCITP x3, MCTS x7, MCSE x2, CCNA, CCDA, BCFP

"Peter D. Jørgensen" <(email address - cut out)> wrote in message
news:48d90eb7$0$90263$(email address - cut out)...

Show quoted text

> Virtual Host: Windows 2008 x64 with Hyper-V RC1, 1x1gb/s NIC, 16 gb ram
>
> Virtual Machine: Windows XP pro SP2 - 2 gb ram
>
> I'm simply testing "ping -t -l 64000 <servername>" from a virtual client
> and I get an average of 10 ms. From ordinary workstations (and the virtual
> host) I get between 1 and 2 ms. I have also tried with legacy network
> drivers, but they are even worse with 25ms.
>
> Isn't it possible to get similar performance from a virtual Windows XP
> under Hyper-V as from ordinary workstations?
>
>
>
> Is this normal behaviour of all virtualization software or is it a known
> Hyper-V "issue"?
>
>
>
> Thanks in advance
>
> Peter
>
>

Re: Hyper-V: Very slow network (latency) on virtual Win XP clients?

Sent: 09/24/2008
From: "Peter D. Jørgensen" <(email address - cut out)>
Message:

"Ryan Sokolowski [MVP]" <(email address - cut out)>

My mistake. I am already using the RTM version (6.0.6001.18016)
So I would still like to know if this normal behaviur of virtual clients.

Has anyone tried my simple ping-test from a virtual client and from the
virtual host?
Do you also encounter 5-10 times as much latency from the virtual client?

/Peter

Show quoted text

> Have you tried the full RTM version of Hyper-V to compare your results?

Re: Hyper-V: Very slow network (latency) on virtual Win XP clients?

Sent: 09/24/2008
From: DevilsPGD <(email address - cut out)>
Message:

In message <48d9fd77$0$90264$(email address - cut out)> "Peter D.
Jørgensen" <(email address - cut out)> wrote:

In my environment we're seeing 1ms-2ms additional latency pinging a
virtual client vs pinging the host.

Show quoted text

>
>"Ryan Sokolowski [MVP]" <(email address - cut out)>
>> Have you tried the full RTM version of Hyper-V to compare your results?
>
>My mistake. I am already using the RTM version (6.0.6001.18016)
>So I would still like to know if this normal behaviur of virtual clients.
>
>Has anyone tried my simple ping-test from a virtual client and from the
>virtual host?
>Do you also encounter 5-10 times as much latency from the virtual client?

Re: Hyper-V: Very slow network (latency) on virtual Win XP clients?

Sent: 09/26/2008
From: "Peter D. Jørgensen" <(email address - cut out)>
Message:

Also with the large package sizes, like my example with 64000 bytes?

I have only tested "from" my VirtHost and VirtClients.
For some reason can I not ping neither VirtHost nor VirtClients from other
workstations or serves. :-(

/Peter

Show quoted text

> In my environment we're seeing 1ms-2ms additional latency pinging a
> virtual client vs pinging the host.

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