[THIN] Re: Keyboard latency/Linux Neoware e140
- From: "Matt Kosht" <matt.kosht@xxxxxxxxx>
- To: thin@xxxxxxxxxxxxx
- Date: Fri, 21 Sep 2007 08:52:49 -0400
I think I found the culprits. Processor queue length and pages/sec
performance counters are well out of recommended value range. After
about 10 app users hit a server the PQL jumps to averages over 6. The
pages/sec jump to an avg of over 50. The silly part is that the CPU's
are not busy on average and there is over a 1GB of physical RAM free.
The ICA latency tracks the spike in PQL almost in parallel.
I am going to try running TScale on this server over the weekend to
maybe get the app to behave better. Otherwise I guess I need a better
server (these are mere dual pIII/1.4 with 2GB running Windows 2000SP4)
but I am not confident they won't exhibit the same characteristics
with regards to memory and processor queue bottlenecking. Is Windows
Server 2003R2 any better at handling this situation? Are the new dual
core Xeon CPU's better at corralling apps that don't try to use avail
CPU more effectively?
On 9/20/07, Matt Kosht <matt.kosht@xxxxxxxxx> wrote:
> That thought had occurred to me. I did check the switch and it
> confirms that the port is operating at 1000Mbit/full duplex. I also
> checked our Cacti server and it's only utilizing 2.2Mbit/sec on
> average, spikes are under 10Mbit/sec. So it's not out of bandwidth.
> I am watching ICA session latency and occasionally seeing 200-500ms
> averages (at different times not consistent across sessions ) averages
> are well below 30ms.
>
> On 9/20/07, Steve Greenberg <steveg@xxxxxxxxxxxxxx> wrote:
> >
> > Given the fact that you can reproduce it with multiple operating systems and
> > client software it does point to a network or server side issue. You should
> > probably monitor the network and also watch the performance counters on the
> > server when this is happening. One stupid little thing to check which still
> > comes up regularly is to make sure your NIC settings match the switch
> > settings!
> >
> >
> > Steve Greenberg
> > Thin Client Computing
> > 34522 N. Scottsdale Rd D8453
> > Scottsdale, AZ 85262
> > (602) 432-8649
> > www.thinclient.net
> > steveg@xxxxxxxxxxxxxx
> >
> >
> > -----Original Message-----
> > From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
> > Of Matt Kosht
> > Sent: Thursday, September 20, 2007 6:48 AM
> > To: thin@xxxxxxxxxxxxx
> > Subject: [THIN] Re: Keyboard latency/Linux Neoware e140
> >
> > I have upgraded the Neo Thin's to v9 of the linux ICA client. No
> > change. I also tested the same apps (Groupwise and a custom app that
> > uses IE) on a PC running ICA 10.x and can reproduce the bouts with
> > typing lag even on the same network as the Citrix server). I have also
> > tested with straight RDP (pc and Neo clients) and can reproduce the
> > lag with these as well. Any tips on what I can do to stop the jerky
> > nature of these apps on a Term server would be most welcome.
> >
> >
> > On 9/18/07, Matt Kosht <matt.kosht@xxxxxxxxx> wrote:
> > > http://support.citrix.com/article/CTX110323
> > >
> > > This seems to indicate that this is a known issue with Neo's and v8.x
> > > of the Linux ICA client.
> > >
> > > On 9/18/07, Matt Kosht <matt.kosht@xxxxxxxxx> wrote:
> > > > Been slowing rolling out this thin client to our company call center.
> > > > Getting some complaints about latency (lag) on keystrokes. CPU/mem
> > > > stats on the Citrix PS 4.0 servers are well within a good range. The
> > > > clients are on a WAN fiber connection to the Citrix servers. Network
> > > > latency is consistently <1ms and max I have seen is 5ms. On the
> > > > Neoware Linux ICA client we have tried disabling encryption,
> > > > compression and have enabled local text echo. The problem still
> > > > persists.
> > > >
> > > > I found this article
> > > >
> > > > http://support.citrix.com/article/CTX108072&searchID=-1
> > > >
> > > > but we are running full screen desktops so I don't think it will do
> > anything.
> > > >
> > >
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