troubleshooting.txt

介绍tornado2.0网络方面的一些问题解决方法

             

       TROUBLESHOOTING SIMPLE NETWORK PROBLEMS IN TORNADO 2.0
       ------------------------------------------------------

If you are new to Tornado 2.0, or you are booting a target for
the first time, or if the target booted successfully, but does
not respond to pings, please read basicNetConfiguration article.
basicNetConfiguration contains instructions on how to configure a
kernel with a target shell and network debugging libraries.  It
contains information to avoid errors like:

   rpccore backend client RPC: Timed out
   Network interface unknown
   muxDevLoad failed for device entry
   wdbConfig: error configuring WDB communication interface
   Error loading file: errno =  0xd0003

If target responded to pings initially, and after running your
socket application (or a library that uses the network such as
the FTP server), applications sputter or hang for a while and
then resume, please read netPerformance article.  It gives an
overview of vxWorks network internals and configuration issues
that impact performance.

This article assumes that a target has booted successfully and
responds to pings initially.  You are either running demo code
from WindSuf->Demo Code->Networking or your own application.

At some point, the target does not respond to pings anymore, or
network performance is slow.  At this point from the target shell,
verify that tNetTask is still running at priority 50.

If i shows tNetTask as suspended, call tt tNetTask.

There might be a reference to a null pointer somewhere, or an
unitialized interrupt.  If this error occurs with a default
configuration, you have not added third party network drivers, or
software, your application is not running, and you are just using
WRS software on a supported BSP, please contact:

   [e-mail].

If application runs fine, but as you increase the number of
sockets or the packet rate, the application sputters or hangs,
run the show functions described below from the target shell
AFTER the target boots and AFTER the problem occurs.

 ->netStackSysPoolShow
 Network stack system memory pool status

 ->netStackDataPoolShow
 Network stack data memory pool status

->i
  which tasks are running, show priorities

->inetstatShow
  shows sockets and their receive queues

->ipstatShow
  show IP protocol statistics 

->tcpstatShow
  show TCP protocol statistics 

->udpstatShow
  show UDP protocol statistics 

->icmpstatShow
  show ICMP protocol statistics 

-->mRouteShow
  show route table, including masks 

->routeShow
  show route table without masks  

->iosFdShow
  show file descriptors

->arpShow
  show ARP table contents

->hostShow
  show host table content

>ifShow
 show interfaces attached to IP.  This function will show
 END and BSD44 drivers.

->muxShow
  show END drivers successfully loaded in the MUX

->endPoolShow("name", 0)
END driver memory pool status of driver "name"
For example: endPoolShow("fei", 0) 

  endPoolShow is not part of the API.  This utility is
  found in utilities.c

SYMPTOMS:

A. ENOBUFS
   SOCKET APPLICATION SPUTTERS

   If the network stack or driver memory pool sizes are too small,
   applications will appear to hang and recover within minutes as
   resources are freed.  Errors like ENOBUFS, or
   S_netBufLib_NO_POOL_MEMORY may occur.

   The problem is most likely insufficient network stack and
   driver buffer pool.  Call netStackSysPoolShow and
   netStackDataPoolShow.  Increase the default allocation if
   there are 0 free buffers available. Increase the driver's
   buffer pool, and IP configuration parameters as indicated
   in netPerformance.

B. TARGET STOPS RESPONDING TO PINGS.
   RPC CORE BACKEND TIMEOUT REPORTED IN TARGET SERVER WINDOW

1. APPLICATION/DRIVER BUFFER LOANING PROBLEMS

   If sockets buffers are not being read, driver buffers will be
   depleted.  As long as the driver is out of buffers, the driver
   will not be able to receive or send packets.  Pings will be
   unanswered.  Target server will be unable to contact the
   target.

   muxShow displays END drivers only.  If the boot device (or the
   other parameter if boot device is floppy, ata...) is  listed
   in muxShow, the driver version used is END.

   ifShow displays both END and BSD 4.4 drivers.

   endPoolShow displays END driver's buffer pool status.  If
   there are 0 free buffers, use inetstatShow to determine which
   socket has data in the receive queue.  This information can
   be used to identify which task is not reading its sockets.
   See netPerformance for an explanation of network driver
   buffer loaning scheme.

2. DRIVER PROBLEMS
  
   If inetstatShow shows no data in the receive queue, the
   problem may be due to a faulty driver:

   If you are using the END driver version, try the BDS44 version
   (if available), and vice-versa.  If the BSP supports more than
   1 network card type, try a different card.  If muxShow does not
   show any drivers, BSD44 drivers are configured.  BSD44 drivers
   are configured if EITHER T101 build method is used, and
   INCLUDE_END is undefined in config.h OR in T2 Project
   facility:

   network components->network devices->End attach interface and
   End interface support components are excluded.

   See basicNetConfiguration document for information on
   configuring drivers.  If changing drivers works, report
   the problem to [e-mail].

   Check WindSurf->Resolve to check Problem Lists and Keyword
   Search.

   If there are no other driver versions you can use, use the
   loopback driver.  Run both the server and the client code in
   the target.  Send to IP address 127.0.0.1.

C. TARGER RESPONDS TO PINGS, BUT DATA TRANSFER STOPS

   If the target responds to pings, but data transfer stops, call
   inetstatShow on the target and the corresponding function
   (usually netstat) on the other host.  If there is data backed
   up in the send side and on the receive side on the other side,
   most likely there is a deadlock situation within the
   client/server application code.  Check if deadlock does not
   occur if you reduce the message size below 1460 bytes.
   (For TCP).  TCP is a stream of bytes.  Loops are required
   to read or write, since TCP can return partial reads and
   partial writes.

D. APPLICATION WORKS BUT NETWORK PERFORMANCE IS SLOW

   See netPerformance article.

E.  PROTOCOL  PROBLEMS

    Check the before and after protocol error statistics show
    routines for clues as to which error is increasing.  Please
    read Section 1.4.1 of NetPerformance article for an
    explanation on UDP full sockets.

F. PRIORITY PROBLEMS

Make sure that tNetTask has a higher priority than application
tasks depending on the network. Please read Section 1.2 of
netPerformance article.

G.  HARDWARE OR DRIVER MISCONFIGURATION PROBLEMS

  1. Try changing the network card or using a different card.
     Examine hub's LED.  Verify that the LED shows activity for
     the driver. 

  2. Configure the BSD44 driver version, if available.  Call
     ifShow to determine if there are collisions, CRC ... The end
     driver does not report this information.  If the driver
     reports excessive collisions make sure that another node in
     the network is not in full duplex mode.

  3. If there are broadcast storms, verify that ifShow does not
     show driver is in PROMISCUOUS mode.


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