Side-effects or negative sides of specific kind of connection

First of all, I have to say that I don't have much experience in networking.
I'm interested to know are there any specific side-effects or negative sides of connecting method I'm currently using.
I have an ADSL modem/router Huawei HG510, which has 4 ethernet ports, locked by internet provider to provide internet connection on ports 1 and 4, IPTV on port 3, and port 2 reserved for VoIP. Close to this router I have AirPort Extreme (n-version) which I've connected to ADSL router in this way:
- _IPTV lan (ethernet 2) port on ADSL router is connected to WAN port on AirPort_
- _Internet connection is provided through ethernet 1 (LAN 1) port on ADSL router which is connected to LAN 1 port on AirPort_
AirPort Extreme is configured as a bridge with manually assigned IP address with DNS set to IP address of ADSL router.
DHCP is running on a ADSL router.
AirPort Extreme provides 802.11g-only WDS network. In another room there is a WDS remote - AirPort Express (b/g model) which is connected to stereo, and also to IPTV STB by using ethernet cable.
AirPort Express is also configured as a bridge with manually assigned IP address and DNS set to IP address of ADSL router. Two computers (one PC and one MacBook Pro) connect to this wireless network (sometimes I connect them to AirPort Extreme by cable) and they both have manually assigned IP addresses.
So basically AirPort Extreme provides both Internet and IPTV streams.
I don't have any special problems with this kind of connection, but I've noticed that sometimes when I reboot the system on MacBook Pro, internet connection is not recognized immediately, and network diagnostic commands such as - arp work with a long delay. This fixes by itself after some time, but I would like to know what cause it.
btw wireless network is set on Multicast rate of 24Mbps
Any comments and suggestions are appreciated.

Is there a reason why you can't connect ethernet 1 (LAN 1) port on the router to the WAN port of the airport extreme base station? I'd have thought that might be better way for it to be networked to internet connection if going to act as bridge. networking internet connection and IPTV at same time may be not ideal situation for extreme base station network.
Anyway, if I'm missing something then it's also possible that your network may just be a bit too technically complex for the extreme base station, it really is aimed to be plug and play and not that user configurable: it either works or it doesn't. If you have to have it as you describe above, and can't improve situation by altering settings present in the airport admin utility, then may want to look at other wireless bridges on the market.

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Hi,
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Any bad side-effects to lengthy blocking in native code? - crosspost

[This question was also posted on the Native Methods forum a day ago, so far no response]
1) Are there any negative side-effects to having one (or maybe a few) Java threads block for an extended period (e.g. hours) in native code? Naturally the thread would NOT be one of the "special" threads (such as the Swing event dispatcher, etc).
2) Does the answer vary by platform? I'm interested in Win32, Linux and possibly Solaris (in that order).
3) What if I scale the number of threads blocked in JNI code up to 100 threads. Does that change any of the answers? This is perhaps a silly number, I'm just trying to understand if more resources are consumed by blocking in the JNI as opposed to blocking in Java.
4) Do modern JVM's use one native thread per Java thread? If so, then I would guess there is really nothing special about blocking in native code.
Lastly, Is this stuff spelled out in some document? Or is there some newsgroup dedicated to the topic? I looked a comp.lang.java.machine, but there is nothing there but spam.
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[This question was also posted on the Native Methods
forum a day ago, so far no response]
1) Are there any negative side-effects to having one
(or maybe a few) Java threads block for an extended
period (e.g. hours) in native code? Naturally the
thread would NOT be one of the "special" threads (such
as the Swing event dispatcher, etc).No. It is common to have a "reader" thread for a blocking socket connection. This results in a block in native code for days (months). The only impact is that you may end up creating alot of threads to handle this blocking code.
>
2) Does the answer vary by platform? I'm interested in Win32, Linux and possibly Solaris (in that order).I would hope not. You may find that WIn32 will run out of threads fairly quickly (at about 1000 threads) Earlier versions of Linux create a different process per thread which can have a non-trival overhead. Solaris will probibly not care. It has a thread number limit but if you reach it you are probibly doing something wroung.
>
3) What if I scale the number of threads blocked in
JNI code up to 100 threads. Does that change any of
the answers? This is perhaps a silly number, I'm just
trying to understand if more resources are consumed by
blocking in the JNI as opposed to blocking in Java.It takes a while to start a thread, it also consumes a minimal amount of per thread memory which can add up if you have 100s of threads. f you are writing the JNI I would suggest writing it to scale such that say more connections/files etc can be handled by a small number of threads (like NIO does) and these issues are reduced.
>
Motivation for query -- In my application I need to
interface with legacy C++ code that blocks (mostly on
socket and i/o selects). I'm not thrilled about native
code, but if there are no serious side-effects to
extended blocking, it may be a viable approach.See above.

Any bad side-effects to lengthy blocking in native code? (Win32,Linux,Solar

1) Are there any negative side-effects to having one (or maybe a few) Java threads block for an extended period (e.g. hours) in native code? Naturally the thread would NOT be one of the "special" threads (such as the Swing event dispatcher, etc).
2) Does the answer vary by platform? I'm interested in Win32, Linux and possibly Solaris (in that order).
3) What if I scale the number of threads blocked in JNI code up to 100 threads. Does that change any of the answers? This is perhaps a silly number, I'm just trying to understand if more resources are consumed by blocking in the JNI as opposed to blocking in Java.
4) Do modern JVM's use one native thread per Java thread? If so, then I would guess there is really nothing special about blocking in native code.
Motivation for query -- In my application I need to interface with legacy C++ code that blocks (mostly on socket and i/o selects). I'm not thrilled about native code, but if there are no serious side-effects to extended blocking, it may be a viable approach.

1) Are there any negative side-effects to having one
(or maybe a few) Java threads block for an extended
period (e.g. hours) in native code? Naturally the
thread would NOT be one of the "special" threads (such
as the Swing event dispatcher, etc).As far as I know the native code is loaded dynamic when a thread will use it.
So if the thread 1 needs the code written in the native.dll the thread 1 will use
the first instance of native.dll. So let's say this is blocked.
Then after 2 hours another thread called thread2 calls the native.dll code. Then
java ask the OS to create another instance of the native.dll and so on.
So now there are 2 threads and 2 instances of the dll in the memory.
All these apply to the Win32 OSs.
>
2) Does the answer vary by platform? I'm interested
in Win32, Linux and possibly Solaris (in that order).
3) What if I scale the number of threads blocked in
JNI code up to 100 threads. Does that change any of
the answers? This is perhaps a silly number, I'm just
trying to understand if more resources are consumed by
blocking in the JNI as opposed to blocking in Java.
If your machine could suffer 100 pure java threads then it is not a problem to be some of them JNI ones.
4) Do modern JVM's use one native thread per Java
thread? Yes. Exactly as far as I know and experienced.
If so, then I would guess there is really
nothing special about blocking in native code.Exactly.
>
>
Motivation for query -- In my application I need to
interface with legacy C++ code that blocks (mostly on
socket and i/o selects). I'm not thrilled about
native code, but if there are no serious side-effects
to extended blocking, it may be a viable approach.Yes it is. That is actually why Native methods are existing for.

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Message was edited by: Agasthuri Doss Baladandapani

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trimanu wrote:
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Side-effects or negative sides of specific kind of connection

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