Re: [Xen-devel] [PATCH] privcmd: MMAPBATCH: Fix error handling/reporting

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, May 22, 2009 at 11:07:53AM -0700, Boris Derzhavets wrote:
> 
>  It's new behavior i might be disconnected from remote Xen 3.4 Host during
> vnc session doing HVM install or just during running HVM via remote vnc
> connection. To restore network i always have to reboot Xen Host itself.
> I suspect hardware issues due to problems between cheap hub and
> Marvel Yukon PC-E Gigabit Ethernet. To scp 4 GB file i always have to replug
> network cable to PCI Ethernet ( RTL 8069SC or E8088 )
>

Could be a driver bug in the dom0 kernel. Drivers for that NIC have been
really crappy..

-- Pasi
 
> However, i attempted to switch off tso at HVM DomU:-
> 
> [root@FHVM ethtool-6]# /usr/local/sbin/ethtool -K eth1 tso off
> Cannot set device tcp segmentation offload settings: Operation not supported
> [root@FHVM ethtool-6]# /usr/local/sbin/ethtool -K eth1 tx off
> Cannot set device tx csum settings: Operation not supported
>

Try switching to PV-on-HVM drivers for much better performance than the
default emulated vNICs.. if not using already.
 
-- Pasi

> Boris.
> 
> --- On Thu, 5/21/09, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
> 
> From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
> Subject: Re: [Xen-devel] [PATCH] privcmd: MMAPBATCH: Fix error 
> handling/reporting
> To: "Boris Derzhavets" <bderzhavets@xxxxxxxxx>
> Cc: "Ian Campbell" <ian.campbell@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
> Date: Thursday, May 21, 2009, 1:16 PM
> 
> Boris Derzhavets wrote:
> > I've compiled 2.6.30-rc6-tip with xenfs built-in and successfully created 
> > and ran
> > Ubuntu 8.10 Server HVM and CentOS 5.3 HVM DomUs with traditional 
> > hvm-profiles.
> > Remote VNC connections to HVM DomUs might be unexpectedly frozen either 
> > broken after 5-10 minutes .
> > 
> 
> That's not new behaviour though, is it?  You reported VNC failures before.  
> Does disabling GSO help?
> 
>    J
> 
> 
> 
>       
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