Re: ioremap()/PCI sickness in 2.4.18-rc2

Jeff V. Merkey
2002-02-20T20:20:11Z

On Wed, Feb 20, 2002 at 07:44:58PM +0100, Steffen Persvold wrote:
> On Wed, 20 Feb 2002, David S. Miller wrote:
>
> > From: Jeff Garzik <jgarzik@mandrakesoft.com>
> > Date: Wed, 20 Feb 2002 12:26:12 -0500
> >
> > type abuse aside, and alpha bugs aside, this looks ok... what is the
> > value of as->msize?
> >
> > Jeff and Jeff, the problem is one of two things:
> >
> > 1) when you have ~2GB of memory the vmalloc pool is very small
> > and this it the same place ioremap allocations come from
> >
> > 2) the BIOS or Linus is not assigning resources of the device
> > properly, or it simple can't because the available PCI MEM space
> > with this much memory is too small
> >
> > I note that one of the resources of the card is 16MB or so.
>
> Hi guys,
>
> There is actually no need to have all three regions mapped at all times is
> there Jeff ? In the Scali ICM driver we actually doesn't ioremap() the
> prefetchable space at all because this is done with the mmap() method to
> the userspace clients. If you have a kernel space client though ioremap()
> is used, but only the parts of it that is needed (based on the number of
> nodes in the cluser and the shared memory size per node).
>
> Regards,
>

I am not using the adapters in user space, I am using them in kernel
space with a distributed RAID agent and file system. This is a general
issue with Hugo's SISCI and IRM drivers and Linux. They all need to work
in every configuration. If it works with less than 1 GB is should work
with > 1GB of memory.

I am looking through get_vm_area() since this is where the bug is. Your
Scali drivers are not the Dolphin released IRM/SISCI but custom drivers
you guys sell with **YOUR** software versions, and they are far from
general purpose.

Jeff

> --
> Steffen Persvold | Scalable Linux Systems | Try out the world's best
> mailto:sp@scali.com | http://www.scali.com | performing MPI implementation:
> Tel: (+47) 2262 8950 | Olaf Helsets vei 6 | - ScaMPI 1.13.8 -
> Fax: (+47) 2262 8951 | N0621 Oslo, NORWAY | >320MBytes/s and <4uS latency