-----Original message----- To: [email protected]; From: Kevin J Kelly <[email protected]> Sent: Thu 27-09-2012 02:43 Subject: [SunRay-Users] Performance tanks after upgrading to 1GB switch, had 100MB > blocks of lines across the screen when I play local video files. > I am running Ubuntu 11.04 with Sun Ray Software 5.2 bundle > Firmware version=4.3_146928-01_2011.06.03.14.41, revision=2 > Sunray server connection is 1GB, Sun Ray 2's primarily > > Essentially I had a unmanaged 100MB Netgear switch worked great user > experience > was fantastic even while videos playing (avi, mp4, etc...) but when I changed > to a 1GB managed NetGear switch the performance has deteriorated > considerably. > I can't play the videos the experience simply is horrible, just lines > across > the screen when the sunray is under load like playing videos > > I saw some posts regarding similar issues and it looked like the outcome was > either the switch or a potential bug ?? > > utcapture indicates: > With the 100MB switch in place, no packet loss or latency > With the 1GB switch in place, packet loss around 10%, got to 16% at one > point, > latency over 1.0 > > Any info would be great, it looks like I may need to dumb down the switch ? > > _______________________________________________ > SunRay-Users mailing list > [email protected] > http://www.filibeto.org/mailman/listinfo/sunray-users >
Hi Kevin, we had a lot of problem with performance, too. As Craig already mentioned, it is heavily related to poor handling of UDP traffic by the switches. All DTUs prior the SunRay 3 are operating at 100Mb/s or less. If the server interface operates at 1Gb/s the switch has to buffer UDP packets until the DTU is able to receive more packets. If the switch isn't capable buffering the UDP stream, you will get lost packets. We finally added a dedicated ethernet interface to the servers for the SunRay interconnect. This interface is bound to 100Mb/s (we reduced the speed at the switch port, as we had difficulties to reduce speed at the linux side in a reliable way). Since we set it up like this, the performance issues went away (mostly). As most servers are equipped with two (or more) NICs nowadays, it shouldn't be a big deal. Carsten _______________________________________________ SunRay-Users mailing list [email protected] http://www.filibeto.org/mailman/listinfo/sunray-users
