Devin, I'll have to defer to more knowledgeable members of this list. The performance you describe, however, is suspiciously similar to what we experienced a few years back before we had tuned our MTU settings [we ultimately settled on 1470]: when going through a PowerPoint stack, we'd get 5-second delays in screen redraw.
The only other time I've seen something like this was when I was using PCSC [PC Smart Card] 1.0 and when I got a normal workload on the SRS, pcscd started taking up 6% of the CPU and users would see many 5-second delays during their session. Scott -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Devin Nate Sent: Monday, March 01, 2010 2:27 PM To: SunRay-Users mailing list Subject: Re: [SunRay-Users] EXTERNAL:Re: EXTERNAL: Sun Desktop AccessClient (SDAC / soft client) poor performance Ahh, now that's something we haven't done yet... packet capture of the uttsc data. So far we've done a packet capture of the dtu<-->srss and compared with sdac<-->srss, and we couldn't see any difference there. I'll report observations asap. That said, would a difference in uttsc traffic to the terminal servers cause utcapture to indicate a higher latency? Thanks, Devin -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Nishimura, Scott L (IT Solutions) Sent: Monday, March 01, 2010 3:16 PM To: SunRay-Users mailing list Subject: Re: [SunRay-Users] EXTERNAL:Re: EXTERNAL: Sun Desktop Access Client (SDAC / soft client) poor performance Devin, How about if you run a truss or pstack or similar troubleshooting tool on uttsc and compare the results between the actual DTU and SDAC? Does your sniffer test show excessive retransmissions? Also, what MTU size is being used? Too large [> 1470?] could lead to fragmentation; too small [< 500] could lead to "laggy" performance [we've run into that before on a physical DTU before]. Scott -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Devin Nate Sent: Monday, March 01, 2010 2:06 PM To: [email protected]; SunRay-Usersmailing list Subject: EXTERNAL:Re: [SunRay-Users] EXTERNAL: Sun Desktop Access Client (SDAC / soft client) poor performance Hi Lars; I completely agree... the problem is, the DTU and SDAC clients are on identical networks... in fact, I've taken the cable out of a perfect DTU and put it into a PC. I was thinking perhaps QoS or something tagging the udp packages. The PCs have Intel nic's. I'm tracking down totally different architectures. Our core is all Cisco networking gear. We're looking to setup a host on the same LAN directly connected to the core, that said we had some hosts in the datacenter getting latency of 500.000, gig connected but on a different subnet. All that aside, the Sun DTU's work perfect on the same network. We're going through everything with a fine tooth comb, but I'm not optimistic. More thoughts? Thanks, Devin -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Lars Tunkrans Sent: Monday, March 01, 2010 2:36 PM To: SunRay-Users mailing list Subject: Re: [SunRay-Users] EXTERNAL: Sun Desktop Access Client (SDAC / soft client) poor performance 2010-03-01 20:31, Devin Nate skrev: > I'm really appreciating the ideas, please keep them coming? > > Thanks, > Devin > Hi, When I experience laggy screen updates on a DTU ist is usually becase there is a problem with the network . As the list can testify: One returning problem is Low end flaky L2 switches with a gigabit input from the CORE switch and 100Mbit link out to the DTU. These L2 switches drops UDP packets and forces the DTU to ask for them again . Hence the Laggy screen updates. Now heres a long shot..... if you are using mainly the same brand pc , do they all have the same LAN Card / CHipset ? There are many kinds of problems with Chinese wierdo combines of PHY / MAC chipsets. They come up with new combinations every week just to be able to produce the motherboard 5 cents cheaper. Should you try an Intel Pro1000 GT Desktop adaptor ? I think so. http://www.intel.com/products/desktop/adapters/pro1000gt/pro1000gt-overv iew.htm This is probably the the most stable ethernet card today, since 3COM stopped making ethernet cards. Did you try to attach the PC directly to core switch yet ? //Lars _______________________________________________ SunRay-Users mailing list [email protected] http://www.filibeto.org/mailman/listinfo/sunray-users _______________________________________________ SunRay-Users mailing list [email protected] http://www.filibeto.org/mailman/listinfo/sunray-users _______________________________________________ SunRay-Users mailing list [email protected] http://www.filibeto.org/mailman/listinfo/sunray-users _______________________________________________ SunRay-Users mailing list [email protected] http://www.filibeto.org/mailman/listinfo/sunray-users _______________________________________________ SunRay-Users mailing list [email protected] http://www.filibeto.org/mailman/listinfo/sunray-users
