I need your help and DEL's tech support doesn't provide any help on this
one.
We have a lot of different type of DELL desktops from old-type
hyper-thread cpu, to dual-core and quad-core cpus (most are Xeons). We
run all versions of CentOS, but most are latest 5.5 (also up-to-date)
and are very happy about that. The primary software on those Linux
systems is IDL, which uses OpenGL libraries usually comes with video
drivers.
Now we are having problem with DELL T3500 with six-core cpu (6 GB
memory). This is the only T3500 and six-core cpu we have right now.
Here is the fact:
1. on T3500 with six-core, CentOS5.5, video card ATI Profire 2260, IDL
7.1. Using dmesg, it report
mtrr: type mismatch for e0000000,10000000 old: uncachable
new:>>>>>>>>>> write-combining
>>>>>>>>>> mtrr: type mismatch for
e0000000,10000000 old: uncachable new:
>>>>>>>>>> write-combining
when run IDL with simple draw function, got segmentation fault
/proc/mtrr:
reg00: base=0xdff00000 (3583MB), size= 1MB: uncachable, count=1
reg01: base=0xe0000000 (3584MB), size= 512MB: uncachable, count=1
Then I switched another ATI RV370, the mtrr error is gone, but still got
segmentation fault
But
2. on T3400 with dual-core, CentOS5.5, same ATI RV370 video card and IDL 7.1,
everything works just fine. By the way, we have never had any such problem with
all our DELL boxes using CentOS and IDL
on T3400, the /proc/mtrr:
reg00: base=0x00000000 ( 0MB), size=65536MB: write-back, count=1
reg01: base=0x3ff00000 (1023MB), size= 1MB: uncachable, count=1
reg02: base=0x40000000 (1024MB), size=1024MB: uncachable, count=1
reg03: base=0x80000000 (2048MB), size=2048MB: uncachable, count=1
When googling, someone out there suggest manually configure the MTRR, can
somebody help us how to configure this six-core's MTRR? I am guessing this
must be MTRR related. Is it possible the current Linux kernel doesn't
understand six-core very well?
Thanks
--
--
Shouben Zhou
Science Systems and Applications Inc.(SSAI)
1 Enterprise Pkwy, Hampton, VA 23666
Tel: (757)951-1905 Fax: (757)951-1900
Email: Shouben.Zhou at nasa.gov
