On Wed, 2009-10-07 at 21:04 +0200, Ivar Janmaat wrote:
> I thought I just could replace my 100 Mbit switch with a gigabit switch.
> Man was I wrong......
>
> Setup:
> Gigabit network interface on Server.
> Sun Ray Server Software 4.2 ea 2
> Solaris Nevada Build 123
> Sitecom Network Gigabit Switch
> Linksys SLM2008 Gigabit Switch
> Linksys SRW2008 Gigabit Switch
> Sun Ray 270
>
> Stress test:
> Open Eye of Gnome image viewer on the Sun Ray and click through about 30
> high resolution images
>
> Situation 1:
> SR Server <-------> SR 270
>
> This works perfect!
>
> Situation 2:
> SR Server <----> Gigabit switch <-----> SR 270
>
> There is packet loss. The build up of the images is hampering and I see
> stripes instead of blocks.
> So what went wrong? I remembered the post in November 2007 in which Kent
> explained this phenomenon:
>
> "The traffic is sent in little bursts at 10 ms intervals. Since it's
> briefly sent at 10x the rate that the output port can handle on the
> switch, some buffering is required on the switch. Bad switches (or
> switches configured to toss UDP packets easily) don't do this buffering
> correctly."
>
> So I arranged for the two more expensive Linksys switches. But all three
> 8 port switches (Sitecom and Linksys) gave the same results. Although
> larger 24 port switches probably have enough memory to buffer, most 8
> port switches apparently do not. As a result the user performance is
> very bad.
> Does anyone know about an 8 port Gigabit switch with enough buffer memory?
> Should the buffer memory be at least the size of the Solaris server udp
> buffer size or should it be bigger?
>
> Workaround hangs server network interface!
> As suggested in earlier e-mails to the list I reduced the server port on
> the Linksys SLM2008 from auto-negotiate (1GB) to 100Mb fixed. This
> resulted in less striping but to my surprise the servers network
> interface died after clicking through about 20 pictures in Eye OG. The
> same thing happened when I tried it with the Linksys SRW2008 switch.
> The only workable solution I found was on the SRW2008.
> It is: Leave the port setting "auto-negotiate" on "enable" but change
> the "admin advertisement" from "Max capability" to "100 Full" This will
> remove all striping and it does not hang up the network interface on the
> server.
>
> My question: Is this bug (dead Gigabit server interface) for
> Opensolaris or for SRSS 4.2?
>
> As for ease of Sun Ray adoption world wide.....
> There should be a better workaround than to reduce bandwidth.
Hi Ivar,
Odd one that - what network interfaces are you using? On my system I
see the problem you report if I use an ngeX interface, but the whole
setup works fine if I use the bgeX interface.
--
Regards
Sean Clarke
---------------------------------------------
SEC Consulting Limited
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