Messages in this thread | | | Date | Fri, 22 Feb 2002 12:49:10 +0100 | From | Steffen Persvold <> | Subject | Re: ioremap()/PCI sickness in 2.4.18-rc2 |
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"Jeff V. Merkey" wrote: > > 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,
I really don't think you're in a position to say wether the Scali driver is general purpose or not, but in any case this issue is OT. My point is that it is not a good idea to keep the prefetchable area mapped at all times. The ICM driver also has kernel clients (e.g. a ethernet emulation driver) and they only ioremap() the areas which is needed based upon the number of nodes in the cluster they communicate with (and only a few Kbytes is mapped from each node).
Regards, -- 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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