ttcp promblem in my 68360 board

[Eric Norum]

"Park, Chan Taek" wrote:
> 
> Hello, rtems-users!
> 
> Eric Norum wrote:
> 
> > "Park, Chan Taek" wrote:
> > >
> > > Hello, rtems-list users!
> > >
> > > I'm now benchmarking the ttcp for my 68360 board's ethernet performance.
> > >
> > > There is no problem when I set the buflen to 8K bytes(this is default in
> > > the ttcp source code) or more than 512 bytes.
> > > In this case the ttcp transmits 16M bytes successfully from my target
> > > board to PC(winnt & cygwin) and vice versa.
> > > And when the ttcp finished it prints out statistics information about
> > > TCP throughput.
> > > But when I set the buflen to small such as 100 bytes with -l option, the
> > > ttcp never completed.
> > > It was blocked forever by the write function after some number of calls
> > > to the write function.
> > >
> > > My board configurations and host environments are that:
> > >
> > >     Target
> > >         MC68EN360 33MHz Rev.C
> > >         16MB DRAM
> > >         SCC1 for ethernet(10Mbps)
> > >         SMC1 for console(38.4kbps)
> > >
> > >     Host
> > >         Windows NT 4.0
> > >         Cygwin32 B20.1
> > >         egcs-1.1b.tar.bz2
> > >         binutils-2.9.1.tar.gz
> > >         newlib-1.8.0.tar.gz
> > >         egcs-1.1b-rtems-diff-19981028.gz
> > >         binutils-2.9.1-rtems-diff-19981027.gz
> > >         newlib-1.8.0-rtems-diff-19981027.gz
> > >         rtems-4.0.0.tgz
> > >
> > > Please help me for that problem.
> >
> > 1) There have been lots of changes made since 4.0.0.  Perhaps that will
> > fix your problem.
> 
> First, I'm sorry for my bad english!
> There is same problem in the current version of rtems, 20000118a.
> I'm working within Redhat 6.0.
> 

This has been fixed for the 68360 in the 4.5.0 beta release.
The problem is present in all network drivers which use scatter/gather
DMA.  As far as I know, the problem has been fixed only in the 68360
driver.  
Joel has a list of drivers which need to be fixed.

-- 
Eric Norum                                 eric at cls.usask.ca
Canadian Light Source                      Phone: (306) 966-6308
University of Saskatchewan                 FAX:   (306) 966-6058
Saskatoon, Canada.