Date: Thu, 22 Feb 2001 10:13:28 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Yoriaki FUJIMORI <fujimori@grafin.fujimori.cache.waseda.ac.jp> Cc: freebsd-alpha@FreeBSD.ORG Subject: Re: 4.2R on up1100 Message-ID: <14997.11416.73311.455787@grasshopper.cs.duke.edu> In-Reply-To: <200102221136.UAA24148@grafin.fujimori.cache.waseda.ac.jp> References: <200102221117.UAA24109@grafin.fujimori.cache.waseda.ac.jp> <200102221136.UAA24148@grafin.fujimori.cache.waseda.ac.jp>
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Yoriaki FUJIMORI writes:
> Folks,
> This is the second report.
> I removed a hard disk from one FreeBSD/Alpha box, and connected it
> to up1100.
> The kernel panics at the same place. But, when I removed one DIMM,
> so that the system have got only 512MB, then up1100 booted properly.
>
> I guess memory over 512MB on UP1000/1100 may not be properly
> handled.
My UP1000 has only 128MB of memory, so I cannot reproduce the problem.
I think the problem is that isa bounce buffer allocation doesn't work
well on alpha for large memory machines. Since the UP1x00 is the only
alpha w/o scatter/gather, it is the only victim of this problem.
I'll bet the contigmalloc() is failing in alloc_bounce_pages(). Since
the alpha busdma_machdep.c was basically copied from i386, I'm going
to assume it is safe to allocate the same amount of memory, which ends
up being 1/2 the number of pages. Can you try the appended patch,
please?
If that doesn't work, we'll need to think harder about where the
memory < 16MB is going on your machine.
Drew
Index: alpha/alpha/busdma_machdep.c
===================================================================
RCS file: /home/ncvs/src/sys/alpha/alpha/busdma_machdep.c,v
retrieving revision 1.7.2.1
diff -u -r1.7.2.1 busdma_machdep.c
--- alpha/alpha/busdma_machdep.c 2000/07/04 01:46:11 1.7.2.1
+++ alpha/alpha/busdma_machdep.c 2001/02/22 15:08:42
@@ -39,7 +39,7 @@
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
-#define MAX_BPAGES 128
+#define MAX_BPAGES 64
struct bus_dma_tag {
bus_dma_tag_t parent;
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