FWIW I see the same behaviour (limited imgae download connections out of Silverlight) on this v3.0 test http://www.conceptdevelopment.net/silverlight3/MapsThatBend01/Default.html
never paid any attention to it before; but now that you mention it does seem strange: i expected since Silverlight is "using the browser networking stack" (and associated cookie support, etc) that it would be able to open as many connections as the browser (and so configurable beyond 2 in some cases). however we also know Silverlight does something 'on top' of the network stack, since it adds the cross-domain policy handling... so there is at least some cause to expect slightly different behaviour than the vanilla browser/AJAX behaviour. whether that is buggy or not is another issue. look forward to the test app; or else might have to run one up myself tonight... be interesting to know whether it's just DeepZoom(/BingMaps) controls, or all SL network requests... On Tue, Jun 23, 2009 at 9:39 AM, John OBrien <[email protected]>wrote: > @Caleb, Each map is getting quad tree tiles from 4 different domains. The > initial WCF call gets the template paths but then these are simply image > requests from a MultiScaleImage (deepzoom) control. > > @Colin, I could live with "2 simultaneous connections to a single server" > but it seems it is doing 2 simultaneous connections total, I have 4 domains > serving images with Bing Maps, in the AJAX world this was fine. > > @Tatham, I also expected that Silverlight would simply support the same > number / configuration as the browser. I'll have to do some more tests to > confirm this. > > @David, System.Net.ServicePointManager doesn't exist in Silverlight as far > as I can tell but it would be great if this was just a configuration > setting... > > I'll build a simple test app later today. Thanks for all your help. > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Tatham Oddie > Sent: Tuesday, 23 June 2009 7:57 AM > To: [email protected] > Subject: RE: Silverlight limited to 2 simultaneous connections? > > Right, but every sane browser on the planet has moved on and increased this > limit. (Yes, *even* IE.) > > Also, the HTML5 WHATWG output will produce an updated set of official > guidelines on the matter. > > In the meantime, Silverlight should support 6 or 8 connections, or even > better, support the same number of connections as the hosting browser > allows. > > > Thanks, > > Tatham Oddie > au mob: +61 414 275 989, us cell: +1 213 422 7068, skype: tathamoddie, > landline: +61 2 8011 3982, fax: +61 2 9475 5172 > my business: tixi.com.au - Ticketing without the dramas > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Colin Savage > Sent: Tuesday, 23 June 2009 7:03 AM > To: [email protected] > Subject: RE: Silverlight limited to 2 simultaneous connections? > > The link supplied earlier in this thread has the answer to this question, > it > is part of the HTTP specification that clients shouldn't have more than 2 > simultaneous connections to a single server. Since Silverlight is going to > be a good citizen, it will apply that part of the spec. > > The last paragraph in > http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html#sec8.1.4 reads: > "Clients that use persistent connections SHOULD limit the number of > simultaneous connections that they maintain to a given server. A > single-user > client SHOULD NOT maintain more than 2 connections with any server or > proxy. > A proxy SHOULD use up to 2*N connections to another server or proxy, where > N > is the number of simultaneously active users. These guidelines are intended > to improve HTTP response times and avoid congestion." > > The server may be able to enforce the connection limitation too but it's > typically going to be a client setting. To get your app to use more than 2 > connections you'd have to change the browser http settings (since SL uses > the browser networking). If you hunt around you can find that registry > setting for IE but what about other browsers? Most people are not going to > be hacking their browser settings to visit a site, so unless this app is > intranet only and you have control over every client, I think you're going > down the wrong road here. > > Regards, > Colin Savage > Readify | Senior Developer > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Caleb Jenkins > Sent: Tuesday, 23 June 2009 12:26 AM > To: [email protected] > Subject: RE: Silverlight limited to 2 simultaneous connections? > > I can see the page from work. Not sure why is wasn't coming up from the > home > office this morning. > > Looking at this under fiddler and it looks like the 6 maps are coming from > the same physical server. > > http://ecn.t0.virtualearth.net > http://ecn.t1.virtualearth.net > http://ecn.t2.virtualearth.net > http://ecn.t3.virtualearth.net > > On the initial load they look like they are differing by sub domains (4 > different sub domains not 6), can anyone confirm that these are in fact > different enough to prevent the server to client limitation? When I do a > refresh it looks like everything is going through: > > > > http://dev.virtualearth.net/webservices/v1/ImageryService/ImageeryServicesvc > > Since all 6 maps are hitting the same data source service, that would > engage > the server 2 simultaneous download limitation. I suggest doing an app that > truly pulls from 6 different servers to confirm a Silverlight limitation. > Example: pull a data feed from search.twitter.com, an image feed from > flickr, a map from virtual earth, a map from google etc... > > Hope that helps! > > Caleb Jenkins > http://developingux.com > > ________________________________________ > From: [email protected] [[email protected]] On > Behalf Of Jordan Knight [[email protected]] > Sent: Monday, June 22, 2009 7:47 AM > To: [email protected] > Subject: RE: Silverlight limited to 2 simultaneous connections? > > Sounds like we need a test app John! > > Better fire up a few WebClients and see where it caps out with IsBusy! > > With Win7VPC you can of course test on every browser ever made :) > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of John OBrien > Sent: Monday, 22 June 2009 10:45 PM > To: [email protected] > Subject: RE: Silverlight limited to 2 simultaneous connections? > > Thanks Nick, another handy link but it seems that even if we change the > server side settings Silverlight on the client side is restricted, example > is only requesting images not using WCF. I will do a WCF example tomorrow > to > see if it is any different however. > > @Caleb - that URL should be working fine, just hit it from 40 machines > around the world: > > http://just-dnslookup.com/index.php?vh=soulsolutions.com.au&c=&s=dns+lookup% > 21 (useful site btw) > > I have scoured the web for information on this and found some very > misleading posts claiming it is the browser restricting it. An identical > AJAX version (Bing Maps, same image URLS) does not have the issue. > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Nick Hodge > Sent: Monday, 22 June 2009 10:23 PM > To: [email protected] > Subject: RE: Silverlight limited to 2 simultaneous connections? > > From the mighty Jorke: > > > http://blogs.msdn.com/wenlong/archive/2009/02/08/why-only-two-concurrent-req > uests-for-load-testing.aspx<http://blogs.msdn.com/wenlong/archive/2009/02/08/why-only-two-concurrent-req%0Auests-for-load-testing.aspx> > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of Jordan Knight > > Sent: Monday, 22 June 2009 10:19 PM > > To: [email protected] > > Subject: RE: Silverlight limited to 2 simultaneous connections? > > > > So go crazy and use a few Silverlight controls and the new instance > > to instance comms stuff in SL3 to load a few at once :P > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of John OBrien > > Sent: Monday, 22 June 2009 9:45 PM > > To: [email protected] > > Subject: RE: Silverlight limited to 2 simultaneous connections? > > > > I think you may be onto something Jordan. The application that has > > brought this to my attention is not server restricted but I appreciate > > your comments Caleb, they are great general suggestions but it seems > > that Silverlight is ignoring them. > > Take a look at: > > http://soulsolutions.com.au/silverlight/blacklight/ > > > > It is rendering 6 Bing map controls inside a single Silverlight > > application. > > The tiles are coming from 4 different domains and yet only two request > > at a time are coming from Silverlight. I'm using IE8. > > > > The performance is horrible, you have to wait for each DeepZoom image > > to complete before the next one starts. Fiddler confirms sets of 2 > > requests. > > > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of Jordan Knight > > Sent: Monday, 22 June 2009 9:22 PM > > To: [email protected] > > Subject: RE: Silverlight limited to 2 simultaneous connections? > > > > I'd have thought it would be a lowest common denominator problem > > myself... > > the crappest browser can do 2 at once so thats what Silverlight > > supports to maintain the best compat? > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of Caleb Jenkins > > Sent: Monday, 22 June 2009 9:13 PM > > To: [email protected] > > Subject: RE: Silverlight limited to 2 simultaneous connections? > > > > John - generally that's a server restriction, and something that has > > been well documented on for IIS as well as various strategies in the > > HTML communities have been developed to help "get around" this. > > > > For IIS its important when you are using IIS as an application / > > middle teir / wcf server with an IIS front end web server. In that > > scenario you still want the limitation from the front end server to > > the clients, but you want to increase the allowed cnnection from the > > app server to the UI server. > > > > The more general html/web strategies involve breaking you resources in > > to various sub domains/servers. Images.domain /css/js/html can be > > placed on various "domains" to increase your simultanious connections > > from 2 to 8. The other strategy is to increase individual payloads and > > decrease number of requests. This plays out by combining multiple > > images on to a single image and the using css and css "sprite" support > > to slice and lay out the images client side. Take a look at the > > bing.com home page for an exaple of that. > > The "blurry" boxes are actually attached to the main image. > > > > Hope that helps! (I'm going to blame all typo's on my phone's > > "intelli- type" > > and the complete lack of a spell check :) > > > > Caleb Jenkins > > > > [email protected] > > m: 469.867.4552 | b: developingUX.com > > > > [*] Improving - It's what we do! > > (send from Windows Mobile 6) > > > > > > ________________________________ > > From: John OBrien <[email protected]> > > Sent: Monday, June 22, 2009 2:16 AM > > To: [email protected] <[email protected]> > > Subject: Silverlight limited to 2 simultaneous connections? > > > > Anyone know why Silverlight2 seems to be restricted to 2 simultaneous > > requests only? > > I have changed the browser settings to allow 8, put in 4 different > > domains to allow for 8 and even used firefox that supports 8 natively > > with no luck. > > > > Is there a configuration somewhere at the plugin level to change this? > > ________________________________ > > Support procedure: https://www.codify.com/lists/support > > List address: > > [email protected]<mailto:[email protected] > > > > > Subscribe: > > [email protected]<mailto:ozsilverlight- > > subscr...@ozs > > ilverlight.com> > > Unsubscribe: > > [email protected]<mailto:ozsilverlight- > > unsubscribe > > @ozsilverlight.com> > > List FAQ: http://www.codify.com/lists/ozsilverlight > > Other lists you might want to join: http://www.codify.com/lists > > ---------------------------------------------------------------------- > > - 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