Re: [ECOS] Problems when aborting tftp transfers

[Øyvind Harboe <oyvind dot harboe at zylin dot com>]

On Mon, 2004-08-02 at 15:01, Andrew Lunn wrote:
> On Wed, Jul 21, 2004 at 12:47:53PM +0200, ?yvind Harboe wrote:
> > I'm seing problems when aborting tftp transfers:
> > 
> > - With CYGSEM_NET_TFTPD_MULTITHREADED == 0, a subsequent tftp transfer
> > after an aborted tftp transfer can get "stuck" since the main tftp
> > server loop is receiving stale packets and hence e.g. _write_file() is
> > invoked for the terminated tftp transfer session(there can be as many as
> > a dozen outstanding stale packets, hence tftp can take a *really* long
> > time to return to normal operation). Q: Is
> > CYGSEM_NET_TFTPD_MULTITHREADED == 0 working as intended for aborted tftp
> > transfers?
> > 
> > - I'm not sure this is a problem or just the way tftp works. When I set
> > CYGSEM_NET_TFTPD_MULTITHREADED==1, tftp works even if I abort transfers,
> > but the current tftp transfer session on the eCos end does not return to
> > the main tftp server loop until the current transfer session has
> > exhausted its retries. 
> 
> I don't follow what you are taking about here. Could you give some
> more details, describe how you produce the problems, what goes wrong
> and how you would expect it to act.

here is what I did:

- with CYGSEM_NET_TFTPD_MULTITHREADED=0.
- started a tftp transfer from Windows machine
- aborted it on the Windows end
- at this point the tftp server goes back to the main loop and sees
multiple tftp transfer initiation requests from the aborted transfer
session. Eventually, the tftp server times out and recovers, but his
takes a *very* long time(minutes at least).
- since I only have a single tftp server thread, subsequent tftp
transfer requests will fail while the tftp server is busy timing out on
the obsolete session initiation requests.

If this rewording does not help explain things, I could try formulating
a patch.

>         Thanks
>                 Andrew
-- 
Øyvind Harboe
http://www.zylin.com



--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss