Re: [Xen-users] Delay opening sockets

[Adam Smith <adam@xxxxxxxxxx>]

Thanks but that's the first thing we tried.  It's not a DNS lookup 
causing the delay (we're connecting by IP address) and we've ruled out 
anything on the remote server.  It occurs on any port, with any service 
as far as we can tell.
Steve Kemp wrote:
> On Tue, Aug 08, 2006 at 04:26:17PM +0100, Adam Smith wrote:
>
>   
> > Hi.  We seem to be experiencing a very odd issue with Xen 3.0 (RPM 
> > version under CentOS).  When establishing a socket (via any application 
> > - for example telnet to a mailserver on port 25) there is an almost 
> > precise 10 second delay before there is any throughput.  This only 
> > happens intermittently and appears to occur on all VDSs on the same 
> > system.  This does not occur on identical physical systems on the same 
> > network.
> >     
>   Whilst this could be a Xen issue have you tested things like
>  DNS?
>
>   It could be that all the services you're attempting to connect
>  to are timing out on doing lookups of the IPs which are connecting.
>  (Or similarly a mailserver might be trying ident lookups.)
>
> Steve
>   
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