Re: [Server-devel] Wireless Cards in the School Server
On Mon, 2009-03-09 at 17:51 +, Dev Mohanty wrote: You could also use the APs in repeater mode with the same SSID, if you're planning to use more then one AP. no that is no very handy if want some performance, a repeater eats bandwidth from the AP. Best for performance - big antenna's antenna's (reduces noise from clients) - channel planning - ap's in bridging mode (no routing or NAT) In a classic E.U (U.S.?) - a server is in a server room - ap is in the class room - maybe use PoE (803.af) over your wired network best, Marten Cheers, Dev On 3/9/09, John Watlington w...@laptop.org wrote: Unless your school is very small, using dedicated wireless interface in the server is probably not a good idea. We suggest dedicated access points as schools with more than 40 - 50 students will need more than one access point, and they are best spread out (i.e. not all the antennas are within three feet of the school server.) There is currently no effort in the XS configuration scripts to recognize and properly configure such an interface. That doesn't mean it won't just work, and I'm sure it could be made to work with minimal effort. As Sameer said, let us know what you decide, and what works for you! -- http://martenvijn.nl Marten Vijn http://www.deupsidevandown.nl *** http://har2009.org August 13-16th http://opencommunitycamp.org 26th Jul 2nd August ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] more 0.5.2-dev02 ejabberd testing
2009/3/6 Daniel Drake d...@laptop.org: I will continue testing by rebooting the server and booting all the XOs again, checking presence visibility, but right now they need a charge, so that will probably have to wait until monday. OK. Booted the server again, and all XOs, and they all managed to see each other just fine. ejabberd memory usage: 0 35124 12 53252 24 64816 36 80036 48 93512 60 108244 72 127000 Also checked olpc-xos output and manually counted the icons at various points, no problems. I then launched a Record activity and shared it between all 72 laptops. It worked very well. However, after shutting a few machines down, some remaining XOs were missing about 80% of the XO icons on the neighborhood view, until sugar was restarted. olpc-xos output was correct and showed all. I think there is probably a sugar bug causing disappearance of icons after the rings of users around activities have disbanded :( Daniel ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] Wireless Cards in the School Server
On 3/9/09, Marten Vijn i...@martenvijn.nl wrote: On Mon, 2009-03-09 at 17:51 +, Dev Mohanty wrote: You could also use the APs in repeater mode with the same SSID, if you're planning to use more then one AP. no that is no very handy if want some performance, a repeater eats bandwidth from the AP. True, using an AP as a reapeater does compromise on your bandwidth, guess its only helpful in cases where you're wanting to extend coverage and not ness improve connectivity. Best for performance - big antenna's antenna's (reduces noise from clients) - channel planning - ap's in bridging mode (no routing or NAT) *Configuring your APs to use different channel from one another. In a classic E.U (U.S.?) - a server is in a server room - ap is in the class room - maybe use PoE (803.af) over your wired network best, Marten ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] Serving 400+ students w/ a single central XS - ejabberd nightmare?
On Tue, 2009-03-10 at 09:58 +1300, Martin Langhoff wrote: On Mon, Mar 9, 2009 at 12:11 AM, Bryan Berry br...@olenepal.org wrote: I am worried about the XO's and not the XS. Now you're starting to see what I've seen :-/ I also worry about your APs and networking infra -- to support 400 active users you'll want at least 8 APs. In more realistic terms, you'll probably need 12, assuming a reasonably balanced load. We will have roughly 8+ AP's. We have found that off-the-shelf AP's can handle around 60-70 users. But that doesn't still doesn't solve the problem of the XO's getting bogged down by tons of ejabberd chatter. DSD: do you have any ideas about this? We are looking at about 100-150 students per school and connecting 3-4 schools to a central XS. As I mentioned before... I am working on xs-0.6, with the moodle-ejabberd magic. That's great, but our pilot starts in a month but that doesn't fit our timeline. I don't want to send out a completely new, untested XS into rural parts of Nepal. Do you have any other suggestions fo us? This dell server has a dual-core Xeon 3.0 GHz processor and 2 GB RAM. RAM was fine, beam only used 450 MB according to ps_mem.py Well, that's 1/4 of your RAM. You need to budget for apache/php, postgres, and squid. Right now the main problem is Squid. That was 450 MB during account creation. It dropped significantly thereafter. I didn't provide much server stats last time because the XS resource usage isn't a critical problem. Thanks for the list below. Quite a few are about stuff I can't help with (roof leaks, power cords...) the others, I'm working on... That's the whole point of why I am telling you about such problems and how they make a centralized XS easier for us to maintain. -- Bryan W. Berry Technology Director OLE Nepal, http://www.olenepal.org ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] Serving 400+ students w/ a single central XS - ejabberd nightmare?
2009/3/9 Bryan Berry br...@olenepal.org: We will have roughly 8+ AP's. We have found that off-the-shelf AP's can handle around 60-70 users. But that doesn't still doesn't solve the problem of the XO's getting bogged down by tons of ejabberd chatter. DSD: do you have any ideas about this? Have only had a chance to test numbers on Linksys WRT54Gsomething routers, which stop accepting new connections after 33 users. yay. I haven't seen XO's bogged down by ejabberd chatter. Ran 75 today while monitoring the TX/RX stats on the LAN interface on the XS and was impressed at how low it was. Yes, the XOs run slow when you view a busy neighborhood view, but it's fine as soon as you switch away. There was a bug where sugar updates every icon on the neighborhood view 10 times every second when you are on that screen (but only when you are on that screen), it's fixed for 0.84. That's great, but our pilot starts in a month but that doesn't fit our timeline. I don't want to send out a completely new, untested XS into rural parts of Nepal. I tried and didn't get any feedback from XS usage in large deployments, so we pretty much figured we'd send it into not-as-rural paraguay and find out what happens (we don't really have any other options!). Daniel ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] Serving 400+ students w/ a single central XS - ejabberd nightmare?
On Mon, 2009-03-09 at 22:36 -0400, Daniel Drake wrote: 2009/3/9 Bryan Berry br...@olenepal.org: We will have roughly 8+ AP's. We have found that off-the-shelf AP's can handle around 60-70 users. But that doesn't still doesn't solve the problem of the XO's getting bogged down by tons of ejabberd chatter. DSD: do you have any ideas about this? Have only had a chance to test numbers on Linksys WRT54Gsomething routers, which stop accepting new connections after 33 users. yay. The linksys is WRT54G total crap. We don't use them. We have found that cheaper AP's do much better. We have good luck w/ random Taiwanese brands like Compex, Lantech, and AZTech. They have Atheros or RealTek chipsets I haven't seen XO's bogged down by ejabberd chatter. Ran 75 today while monitoring the TX/RX stats on the LAN interface on the XS and was impressed at how low it was. Yes, the XOs run slow when you view a busy neighborhood view, but it's fine as soon as you switch away. There was a bug where sugar updates every icon on the neighborhood view 10 times every second when you are on that screen (but only when you are on that screen), it's fixed for 0.84. I saw it drop as well when I changed out of the Network View, but it still remained fairly high w/ 200 very active users, too high to keep me from launching EToys That's great, but our pilot starts in a month but that doesn't fit our timeline. I don't want to send out a completely new, untested XS into rural parts of Nepal. I tried and didn't get any feedback from XS usage in large deployments, so we pretty much figured we'd send it into not-as-rural paraguay and find out what happens (we don't really have any other options!). Daniel I think that is because large deployments like Uruguay aren't using the XS and others like Mongolia don't have the technical expertise to monitor such things. That leaves new large deployments like Paraguay and Nepal in an unenviable position as pioneers. -- Bryan W. Berry Technology Director OLE Nepal, http://www.olenepal.org ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] Serving 400+ students w/ a single central XS - ejabberd nightmare?
On Mon, Mar 9, 2009 at 7:04 PM, Bryan Berry br...@olenepal.org wrote: On Tue, 2009-03-10 at 09:58 +1300, Martin Langhoff wrote: On Mon, Mar 9, 2009 at 12:11 AM, Bryan Berry br...@olenepal.org wrote: I am worried about the XO's and not the XS. Now you're starting to see what I've seen :-/ I also worry about your APs and networking infra -- to support 400 active users you'll want at least 8 APs. In more realistic terms, you'll probably need 12, assuming a reasonably balanced load. We will have roughly 8+ AP's. We have found that off-the-shelf AP's can handle around 60-70 users. But that doesn't still doesn't solve the problem of the XO's getting bogged down by tons of ejabberd chatter. DSD: do you have any ideas about this? We are looking at about 100-150 students per school and connecting 3-4 schools to a central XS. As I mentioned before... I am working on xs-0.6, with the moodle-ejabberd magic. That's great, but our pilot starts in a month but that doesn't fit our timeline. I don't want to send out a completely new, untested XS into rural parts of Nepal. Do you have any other suggestions fo us? What if you had a small footprint box (like a soekris or routerboard) at the school that talks to APs on one end via a switch, and does tunneling back to XS in a central location? That way you would have a fairly dumb tunnel unit at school (literally plug-and-play) and XS management back at your central shop. Sameer -- Dr. Sameer Verma, Ph.D. Associate Professor of Information Systems San Francisco State University San Francisco CA 94132 USA http://verma.sfsu.edu/ http://opensource.sfsu.edu/ This dell server has a dual-core Xeon 3.0 GHz processor and 2 GB RAM. RAM was fine, beam only used 450 MB according to ps_mem.py Well, that's 1/4 of your RAM. You need to budget for apache/php, postgres, and squid. Right now the main problem is Squid. That was 450 MB during account creation. It dropped significantly thereafter. I didn't provide much server stats last time because the XS resource usage isn't a critical problem. Thanks for the list below. Quite a few are about stuff I can't help with (roof leaks, power cords...) the others, I'm working on... That's the whole point of why I am telling you about such problems and how they make a centralized XS easier for us to maintain. -- Bryan W. Berry Technology Director OLE Nepal, http://www.olenepal.org ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
