Re: Recent versions of pxeboot hang/panic on AMD platform.

On Friday 21 November 2008 6:41:04 pm Luigi Rizzo wrote:
> On Fri, Nov 21, 2008 at 03:23:25PM -0800, Andrew Thompson wrote:
> > On Sat, Nov 22, 2008 at 12:14:00AM +0100, Luigi Rizzo wrote:
> > > [copying some people involved with recent related commits]
> > > 
> > > As reported in  kern/118222 recent versions of pxeboot hang/panic
> > > on AMD platform.
> > > 
> > > Initial reports mentioned that the RELENG_6 versions worked well,
> > > however i found out that even the recent RELENG_6 code is problematic.
> > > 
> > > Specifically, the problem i see on two machines with AMD CPU (one
> > > is an Asus M2N-VM) motherboard netbooting with PXEboot, is that the
> > > loading of config files or binary modules (kernel, etc.) randomly
> > > hangs with recent version of pxeboot (RELENG_6, RELENG_7 and HEAD
> > > all give the same behaviour).
> > 
> > I have found that the kernel size can trigger this for me, after
> > reducing the size I didnt experience loader hangs with pxe. You may want
> > to experiment with this in your investigations.
> 
> no luck - the hang often occurs as early as while reading loader.conf,
> which is way smaller than the kernel.
> 
> Assuming that the interrupt thing is a possible cause for the bug,
> I can understand that the kernel size can affect the probability of
> getting an interrupt at the wrong time.
> 
> There was one bug due to memory overflow that i fixed in a recent
> commit to head (see boot/common/interp.c),
> but this only helped on a different amd64 motherboard.

Is this now resolved with the latest pxeboot from HEAD?

-- 
John Baldwin