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Date: Wed, 20 Feb 2002 13:36:19 -0700
From: "Jeff V. Merkey" <jmerkey@vger.timpanogas.org>
To: Steffen Persvold <sp@scali.com>
Cc: "David S. Miller" <davem@redhat.com>, jgarzik@mandrakesoft.com,
        linux-kernel@vger.kernel.org, jmerkey@timpanogas.org
Subject: Re: ioremap()/PCI sickness in 2.4.18-rc2
Message-ID: <20020220133619.A729@vger.timpanogas.org>
In-Reply-To: <20020220.093034.112623671.davem@redhat.com> <Pine.LNX.4.30.0202201940480.20082-100000@elin.scali.no>
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In-Reply-To: <Pine.LNX.4.30.0202201940480.20082-100000@elin.scali.no>; from sp@scali.com on Wed, Feb 20, 2002 at 07:44:58PM +0100
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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
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