On 28.12.2013 12:18, rkwesk_ltsp wrote: > I thought I had this figured out but I'd like to confirm: > > Configuration 1 > > unmanaged switch w 1 giga port and 16 100 ports not connected directly > w router > Server with two nics, one gigabit to giga port on switch and one 100 > bit to router directly. > Clients, mixed thin and fat but all with 100 bit nics to same switch to > 100 bit ports. > > Configuration 2 > > unmanaged switch w 1 giga port and 16 100 ports, one of 100 bit ports > connected w router > Server with one nic (giga) to giga port on switch > Clients, mixed thin and fat but all with 100 bit nics to same switch to > 100 bit ports. > > In both cases (I think) there should be no overload and so the possible > complications with flow control are avoided. > > Is this correct?
No, I think you will experience head-of-line blocking if the switch has flow control enabled. Most of the traffic in LTSP is from the server to the clients. Say a client watches an HD youtube video. This will easily generate more than 100Mb/s of traffic and will overload the client's 100Mb/s port. The switch will send pause frames to the server, effectively throttling down it's 1Gb/s port to a slower speed. This will unnecessarily affect all other clients' traffic, too - this is what is called head-of-line blocking. That article explains it quite well (just multiply the speeds by a factor of 10 ;) ) http://virtualthreads.blogspot.co.at/2006/02/beware-ethernet-flow-control.html Jakob ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net
