[ECOS] Network dead after abnormal break

[ECOS] Network dead after abnormal break

[David Geng]

Hi, there,

The network will die, if a TCP connect is broken abnormally, for example by
Ctrl-C at host. I don't know if it is the problem of TCP/IP stack or my
CS8900A driver porting. eCos seems still working, for I can use GDB to stop
it and do some single steps. Maybe the interrupt response is lost.

Regards

David

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Re: [ECOS] Network dead after abnormal break

[Jonathan Larmour]

David Geng wrote:
> 
> Hi, there,
> 
> The network will die, if a TCP connect is broken abnormally, for example by
> Ctrl-C at host. I don't know if it is the problem of TCP/IP stack or my
> CS8900A driver porting. eCos seems still working, for I can use GDB to stop
> it and do some single steps. Maybe the interrupt response is lost.

If it's of any help to know, we've had it working with other drivers, so it
may be that driver in particular.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Un cheval, pas du glue. Pas du cheval, beaucoup du glue. || Opinions==mine

Re: [ECOS] Network dead after abnormal break

[Jonathan Larmour]

David Geng wrote:
> 
> In my test program, the receiving code is like this:
> 
> while(1) read(sock, buf, sizeof(buf));
> 
> When the connection is broken, read() will return 0. From then on, if we
> continue using read() to try to get some data, the whole TCP/IP stack will
> die. 

That definitely should not happen. Has anyone else observed this? (I
haven't got any net-able hardware on my desk right now to try). It does
sound like it would be the stack, not the driver.

> So I changed like this:
> 
> while( read(sock, buf, sizeof(buf));
> 
> It works well. The peak receiving speed can reach 1.05MByte, while sending
> is 0.9MByte.
> 
> Also I found a bug in the original CS8900A driver. After patch, it can work
> more stably and more efficiently. If anyone is interested in it, I can
> provide the source code.

We're going to be a lot more responsive to patches now, so please send it
in!

Jifl
 
 
> ----- Original Message -----
> From: "Jonathan Larmour" <jlarmour@redhat.com>
> To: "David Geng" <deli.geng@ncl.ac.uk>
> Cc: <ecos-discuss@sourceware.cygnus.com>
> Sent: Friday, January 05, 2001 11:14 PM
> Subject: Re: [ECOS] Network dead after abnormal break
> 
> > David Geng wrote:
> > >
> > > Hi, there,
> > >
> > > The network will die, if a TCP connect is broken abnormally, for example
> by
> > > Ctrl-C at host. I don't know if it is the problem of TCP/IP stack or my
> > > CS8900A driver porting. eCos seems still working, for I can use GDB to
> stop
> > > it and do some single steps. Maybe the interrupt response is lost.
> >
> > If it's of any help to know, we've had it working with other drivers, so
> it
> > may be that driver in particular.
> >
> > Jifl
> > --
> > Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
> > Un cheval, pas du glue. Pas du cheval, beaucoup du glue. || Opinions==mine
> >

-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Un cheval, pas du glue. Pas du cheval, beaucoup du glue. || Opinions==mine