Linux client specweb test hung

Linux client specweb test hung

[Hua Qin]

Hi,

I think someone already have this discussion about this hung, but I did
not see some solutions about. Here is my test case:

1 Zeus web server: kernel 2.4.7-10
7 Specweb clients: kernel 2.2.16

After the client hang, I used netstat to see the connections, and found
some clients still keep the ESTABISHED connections, but there is no
connection on the server side.

I use tcpdump to look at how the server and clients to close the
connections. There are scenarios: 
1. The server send FIN first 
2. The client send  FIN first

If the server send  FIN first:
	client			server
	 <-----------FIN---------
	 ----------- ACK-------->
	 ----------- FIN-------->
	<------------ACK--------

If the client send the FIN first:

	client 			server
	--------------FIN-------->
	<-------------ACK--------
	
	or

	client			server
	-------------FIN--------->
	<------------FIN----------
	------------ACK---------->


The following is my guess:
When the iteration finishes everytime, if the FIN happeens to be sent from
the server side, the connection will closed correctly, if the FIN happens
to be sent from the client slide, the client will be hung. Is this
related to LAST-ACK issue?

Thanks!!
Hua

Re: Linux client specweb test hung

[Alan Cox]

On Sat, 2002-09-14 at 14:08, Hua Qin wrote:
> 
> Hi,
> 
> I think someone already have this discussion about this hung, but I did
> not see some solutions about. Here is my test case:
> 
> 1 Zeus web server: kernel 2.4.7-10
> 7 Specweb clients: kernel 2.2.16

2.4.17 is an old kernel with multiple errata fixes.
2.2.16 is obsolete, with known later networking, driver and other bugs
fixed.

Start with something current and see if you can duplicate the problem.

Re: Linux client specweb test hung

[Hua Qin]

On 14 Sep 2002, Alan Cox wrote:

> On Sat, 2002-09-14 at 14:08, Hua Qin wrote:
> > 
> > Hi,
> > 
> > I think someone already have this discussion about this hung, but I did
> > not see some solutions about. Here is my test case:
> > 
> > 1 Zeus web server: kernel 2.4.7-10
> > 7 Specweb clients: kernel 2.2.16
> 
> 2.4.17 is an old kernel with multiple errata fixes.
> 2.2.16 is obsolete, with known later networking, driver and other bugs
> fixed.
> 
> Start with something current and see if you can duplicate the problem.
> 
> 
So do you think 2.4.7-10 or 2.4.17 has multiple errata fixes. or both :)
Thanks!
Hua