RE: [Xen-users] Problems with GPLPV network latency

["Ian Tobin" <itobin@xxxxxxxxxxxxx>]

To be honest this is the first time ive seen it happen but this is a new Dom0 so im not sure if something is not set.

 

Im running XEN 4.0 with 2.6.32.14 kernel.

 

From: Robert Dunkley [mailto:Robert@xxxxxxxxx]
Sent: 08 June 2010 10:00
To: Ian Tobin
Subject: RE: [Xen-users] Problems with GPLPV network latency

 

Probably not a timing issue then. I would look at disabling offload features in Dom0 using Ethtool or maybe James Harper (The creator of the drivers) will offer up a suggestion later in the day. If those pings are on a Lan then they are very high.

 

The latest GPLPV works well for me on Server 2008 R2 X64.

 

From: Ian Tobin [mailto:itobin@xxxxxxxxxxxxx]
Sent: 08 June 2010 09:56
To: Robert Dunkley
Subject: RE: [Xen-users] Problems with GPLPV network latency

 

Yes just check, says 2.8 which is what the CPU is

 

 

From: Robert Dunkley [mailto:Robert@xxxxxxxxx]
Sent: 08 June 2010 09:50
To: Ian Tobin
Subject: RE: [Xen-users] Problems with GPLPV network latency

 

Its set in the config file:

“timer_mode = 1”

 

Some version ofXen default to 0 and others to 1 but Windows VMs should use 1. Is the clock rate of the cpu accurately reported in device manager on the VM?

 

 

Rob

 

From: Ian Tobin [mailto:itobin@xxxxxxxxxxxxx]
Sent: 08 June 2010 09:47
To: Robert Dunkley
Subject: RE: [Xen-users] Problems with GPLPV network latency

 

Hi Rob,

 

Sorry, where is timer_mode set ?

 

Thanks

 

Ian

 

 

From: Robert Dunkley [mailto:Robert@xxxxxxxxx]
Sent: 08 June 2010 09:43
To: Ian Tobin
Subject: RE: [Xen-users] Problems with GPLPV network latency

 

Hi Ian,

 

 

Is timer_mode set to one? Have you tried disabling large send offload in Dom0 using Ethtool and in the GPLPV driver in device manager?

 

 

Rob

 

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ian Tobin
Sent: 08 June 2010 09:32
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Problems with GPLPV network latency

 

Hi,

 

DomU is a Win2008 R2 64

 

When i install the GPLPV drivers the network latency goes from 15ms to random numbers up to 1200ms and eventually dies.  If you run a ping from the DomU to another host the network stays alive but the high latency is still there.

 

Further more if i try and uninstall the network driver i am unable to use the old one (realtek) as it cannot detect the device.

 

Also if I uninstall everything using the installer the DomU blue screens on reboot, im not sure how to get round that without a rebuild?

 

Thanks

 

Ian

 

 

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The SAQ Group

Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ
SAQ is the trading name of SEMTEC Limited. Registered in England & Wales
Company Number: 06481952

 

http://www.saqnet.co.uk AS29219

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The SAQ Group

Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ
SAQ is the trading name of SEMTEC Limited. Registered in England & Wales
Company Number: 06481952

 

http://www.saqnet.co.uk AS29219

SAQ Group Delivers high quality, honestly priced communication and I.T. services to UK Business.

Broadband : Domains : Email : Hosting : CoLo : Servers : Racks : Transit : Backups : Managed Networks : Remote Support.

 

 

 

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