On Fri, Nov 02, 2007 at 04:16:14PM -0400, Bob Doolittle wrote: > Gary Mills wrote: > >On Fri, Nov 02, 2007 at 02:17:46PM -0400, Bob Doolittle wrote: > >>What kind of hardware platform are you using? > >>Are you using Solaris or Linux? > > > >Solaris 10 8/07 x86. > > Hardware configuration please? How much memory? > How many sessions on your server (not just active ones)?
16 gigabytes on an X4200. Only one session. > >>If you have an undersized and overloaded server, > >>any period of intense system activity can cause > >>temporary starvation of heartbeats to the Sun Ray > >>which can result in timeouts such as you describe > >>if the resource oversubscription is sufficiently > >>large and/or kernel scheduling is sufficiently > >>poor. So we need to understand your situation better. > > > >No, it's not that. The Sun Ray server is typically idle. > >I can produce the timeout reliably with those three triggers. > >It only happens with my Sun Ray behind my NAT router. > > I occasionally see this on small systems which are paging heavily > (e.g. a U40 with 2GB memory and 4-5 sessions). This can happen > even with only one active Sun Ray if there are a number > of inactive sessions with processes with large RSS segments which > can't be paged out. As I said before, that's not the problem. > But I don't know how NAT would come into play. There's little > in common with logging into Solaris and logging into Windows > with uttsc. Perhaps larger WAN latencies and/or a lossy WAN > link exacerbate the problem of heartbeat starvation under paging > load. What does utcapture tell you during this period? How about > vmstat, do you get a spike in paging activity during this period? I disagree. Both logging in and starting a Windows connector session initiate a new connection to the Sun Ray client. NAT means that my Sun Ray can initiate connections, but can't accept them without cooperation with the NAT router. I included the snoop results in a previous message. It's pretty clear. Something changed in the most recent version of the Sun Ray server software to provoke this behavior. -- -Gary Mills- -Unix Support- -U of M Academic Computing and Networking- _______________________________________________ SunRay-Users mailing list [email protected] http://www.filibeto.org/mailman/listinfo/sunray-users
