w*******g
发帖数: 9932 | 1 come on.
garbage collector doesn't always use reference counting.
copying collector or mark & sweep collector can delete these objects
because they are no longer reachable. |
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z**r
发帖数: 17771 | 3 neighbor reachable time设成多大，就在那个interval 有packet drop。这个怪俺第
一个帖子没说清楚，只笼统的说了一句nd timer，应该是nd ReachableTime。
俺是通过两个办法fix这个的，第一种去掉static，跑OSPFv3 or ISIS，第二种是把
static routes的next hop改成对方router的link local address。不过说到底，这两
种其实还是一个fix，dynamic routing protocol(IGP)也是用link local作为next hop
的。
那问题是为什么用link local就可以fix呢？ |
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s******v
发帖数: 4495 | 4 有multicast, ipv6, vpnv4 unicast, l2vpn vpls, 这些都是SP上面的常有的
SP里面的IGP就是carry PE/ASBR loopback 这些NH reachability
不过你这么问，应该是enterprise里面的用法， |
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a*******n
发帖数: 258 | 5 【 以下文字转载自 Windows 讨论区 】
发信人: atwoseven (A27), 信区: Windows
标 题: windows 7 有些网站上不去
发信站: BBS 未名空间站 (Thu Sep 10 22:10:16 2009, 美东)
windows 7 x64 professional，经常出现有的网站上不去，比如dealsea，paypal等，
msn也上不去。点msn的trubleshoot，提示到了defaut gateway这里就错掉了。同样的
时间，用xp就可以。
这怎么回事，难道是windows 7 的bug？
上dealsea， paypal等上不去，ie提示：
This problem can be caused by a variety of issues, including:
旾nternet connectivity has been lost.
昑he website is temporarily unavailable.
昑he Domain Name Server (DNS) is not reachable.
昑he Domain |
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m*****n
发帖数: 760 | 6 是不是这个版本的不支持啊？
在Administration页面有下面一段Notes:
请版上的各路大仙出手解惑。
IP Traffic is about monitoring IPv4 network traffic flowing through the
router.
Check your LAN Settings before enabling this feature: any/all LAN interfaces
must have a netmask with at least 16 bits set (255.255.0.0).
Monitoring of larger subnets is not supported.
Other relevant notes/hints:
Before enabling this feature, please check your LAN Settings and make sure
the netmask on any/all of your LAN bridges has been configured properly (i.... 阅读全帖 |
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l***y
发帖数: 791 | 7 you should have finished network analysis before you seriously thinking
about deploying an VOIP solution, your network should be
1) QoS enabled
2) round-trip time between sites less than 400 ms
3) no big jitter, packet loss <1%, packet out of sequence at minimal
4) em, dynamically routed and reachable? :0~
5) you have to decide if this is going with h323 or sip, if sip, is it going
to be
dns dependant. |
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c*******t
发帖数: 5182 | 8 每次都可以上msn，一打开网页就是下面这些：
请问怎么解决阿
thanks
Internet Explorer cannot display the webpage
Most likely causes:
You are not connected to the Internet.
The website is encountering problems.
There might be a typing error in the address.
What you can try:
Diagnose Connection Problems
More information
This problem can be caused by a variety of issues, including:
Internet connectivity has been lost.
The website is temporarily unavailable.
The Domain Name Server (DNS) is not reachable.
The |
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c*******c
发帖数: 7 | 9 This can only create self-signed applet. It is useful for
testing purposes. For use of public reachable applets, there
will be needed a "real" certificate issued by an authority
like VeriSign or Thawte.
See details on how to sign an applet at:
http://forum.java.sun.com/read/16803020/qAq2AUAbu0IoAAY0J#LR |
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m*****k
发帖数: 731 | 10 according to the book, for an obj to be GC,
finalize() is never run more than once on any object,
I am puzzled here, since it is possible that the obj is made reachable again
in its finalize(), then after a while, this obj may again become unreachable,
then finalize might again be called. 如此往复。 so the finalize() is called
more than once.
望指教，谢谢啦。 |
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m******t
发帖数: 2416 | 11
express
good
There is a difference between "referred objects will never be GCed"(not true),
and "reachable objects will never be GCed"(true).
IMHO, explicitly setting references to null essentially defeats the purpose of
having gc in Java - to relieve programmers from memory management.
I've always been a strong believer of Java gc, and I think I'm going to
continue
to be one, based on its track record with me. |
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g*****g
发帖数: 34805 | 12 No, practically you won't have many large unused objects.
When I said large, most of the time it's resources like multiple dimension
arrays, images, a/v clips, network connections, database connections. These
are objects you should take care a bit, especially when they are instance
variables which would be reachable throughout of object lifetime. You don't
need to remember every object you use, just be aware of those memory intensive
ones. It's good pratice and good style. Assign it to null afte |
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R***Z
发帖数: 1167 | 13 In Java, suppose obj A has a reference to obj B, obj B has a reference to obj
C, and obj C has a reference to obj A. And no one else has any reference to
these 3 objs. So each of them has a reference count of 1. But they should
really be GCed because they are not reachable by any means. How does the
garbage collector know these 3 objs can be GCed? Thanks. |
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