Hi Bob;
The machines are idle, but good call ... we're to the point now of doing fresh
installs just for the purpose of testing SDAC. No swapping, memory is good, and
all cores (some are dual core, some quad core) are idle.
Ethernet stats are good... no dropped packets reported by the Ethernet cards or
the utcapture.
The PCs are lab PCs, fully in our control, and performing well, except for SDAC.
Definitely no spyware/virus activity on these (as they're fresh built).
We've tried different AV software and settings running, including none for
testing.
We've used different PCs also, to ensure it's not just one bad PC. Mostly
IBM/Lenovo PCs, although I think we used one Dell.
...??? still no luck
I'm really appreciating the ideas, please keep them coming?
Thanks,
Devin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Bob Doolittle
Sent: Monday, March 01, 2010 12:22 PM
To: SunRay-Users mailing list
Subject: Re: [SunRay-Users] EXTERNAL: Sun Desktop Access Client (SDAC / soft
client) poor performance
I'd look closely at what is running on the PCs besides SDAC. If SDAC
can't get cycles that would show up as latency for servicing packets.
Scan for spyware/viruses, use the Task Manager, etc.
-Bob
Devin Nate wrote:
As a follow up, there are no lost packets for either system. Simply a huge
difference in latencies. The network (ICMP) is reporting 10-20 ms. The Sun
DTU's are reporting 10-20 ms. There's no reason for SDAC to report 500+ ms.
Maybe a bug in the SDAC causing really high latencies? Maybe a bug in utcapture
as to what it's reporting.
We're going through our network, including with Wireshark/pcap ... so far, we
cannot see any differences between the packages generated by a DTU and that of
SDAC.
We're going to put a SDAC machine on the same LAN in the data center and see
what happens... but.
Any more thoughts??
Thanks,
Devin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Devin Nate
Sent: Monday, March 01, 2010 11:10 AM
To: SunRay-Users mailing list
Subject: Re: [SunRay-Users] EXTERNAL: Sun Desktop Access Client (SDAC / soft
client) poor performance
Hi Scott;
Thanks for the initial tip... so, yes, there's a huge amount of additional
latency for the SDAC clients. I don't know why.
Our Sun Ray DTUs are running a latency of between 10-20, and they perform great.
Our SDAC clients are running a latency of 500.000 to 516.000, and they perform
bad (understandable with latencies like that).
Now I've literally just unplugged the cable from one of our DTUs and plugged it
into one of our test PCs, and it still shows this large change in latency. All
power mgmt has been disable on the PC, etc. Any thoughts as to what could cause
latency to be so wildly different between these 2 systems?
Thanks,
Devin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nishimura, Scott L (IT
Solutions)
Sent: Monday, March 01, 2010 10:24 AM
To: SunRay-Users mailing list
Subject: Re: [SunRay-Users] EXTERNAL: Sun Desktop Access Client (SDAC / soft
client) poor performance
Devin,
What does utcapture show for those slow SDAC clients? Any
appreciable packet loss or latency?
Scott
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Devin Nate
Sent: Monday, March 01, 2010 9:15 AM
To: [email protected]
Subject: EXTERNAL:[SunRay-Users] Sun Desktop Access Client (SDAC / soft
client) poor performance
Dear SunRay Users;
We have begun testing the Sun Desktop Access Client (SDAC), and have
experienced poor performance. I am looking for a solution.
When I say 'poor performance', we are seeing laggy screen redraws and
'blocking' where certain blocks of the screen will be visibly not
updated. We run nearly exclusively in kiosk mode, using uttsc, and the
operations/things we're doing are very basic (we are not watching
movies, flash, etc). All we are doing is logging in, opening word/excel,
pushing the start button, etc., all which show lag and blocking. The
performance is such that while technically working, the end user
experience isn't solid enough that we can deploy the SDAC.
By comparison, on the exact same network and using the same Sun Ray
Servers v5, we have a number of Sun Ray ultra thin clients (DTUs). The
Sun Rays work as desired, and if the SDAC was working the same I'd be
more than happy. I'm rather shocked that a full fledged PC cannot
achieve the same performance.
Also by comparison, raw RDP from the PCs achieves the same excellent
performance as the Sun Ray thin clients.
Environment:
Servers:
Our srs servers are 2x Red Hat Enterprise Linux 64-bit servers running
the most current SRSS software. They live in VMware ESXi v4.0u1
Enterprise, and exist in a FOG configuration. The Sun Ray Servers are
connected via internet to our clients ... so the actual DTUs are not on
the same LAN as the Sun Ray Servers. There is an approx 15-25ms rtt for
ping/icmp packets. Again, I don't suspect a server problem, in so much
as the Sun Ray DTUs work excellent.
DTUs:
Our DTUs are Sun Ray ultra thin clients, model 2's and model 270's. They
work great. They are connected to the exact same network/ports/etc as
the PCs below. These DTU's have a MTU of 1200.
PCs using SDAC:
Our PCs are a combo of Windows 7 professional 64 bit and WinXP
professional 32 bit. All running SDAC 1.0.51. These are the machines
that see the performance/blocking problems. We've adjusted MTU in the
software ranging from 500 (the minimum) to 1500 (the maximum), including
at 1200. We've also turned on/off compression and lossless compression.
None of these options have helped.
Thanks, and look forward to any information people can share that might
help.
Devin Nate
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