Red Hat Bugzilla – Bug 371791
RHEL 5.1 x64 xen does not work with 256GB memory
Last modified: 2010-10-22 16:09:41 EDT
Description of problem:
RHEL 5.1 x64 xen should support 256GB of memory installed.
cat /proc/meminfo only shows 163GB with this configuration
When running certification with greater than 64GB, the system will lock up.
Version-Release number of selected component (if applicable):
Red Hat Enterprise Linux 5 Update 1 x64 (10/17/2007)
Always, use the Xen kernel and more than 64GB. We are testing using an HP
ProLiant DL580 G5 with 256GB of memory. HTS was run on the BL680c with more
than 64GB (128GB) which encountered the lockup.
Issue tracker opened for this. 140420
This has been committed for the beta.
You can download this test kernel from http://people.redhat.com/dzickus/el5
Red Hat is tracking the patch for this issue under the following BZ, which is
confidential to another party.
Please make sure you scan the changelog for the beta for this reference BZ.
Looks like information is not properly flowing from IT to BZ. Here's the latest
entry in the IT:
Event posted 03-12-2008 01:54pm EDT by sandy.garza
Internal Status set to 'Waiting on Support'
Retest failed with Kernel 82.el5.
Status set to: Waiting on Tech
Um, we need a lot more information than that. How does it fail? Any console
logs, anything from dmesg, xm dmesg, etc. etc.?
Created attachment 298310 [details]
Serial Output Using dzickus kernel
This is from the xen -75 kernel on dzickus. This is the output when the kernel
boots to xen via the serial port. I ran with the beta release of the kernel
-85 with similar results.
Created attachment 298311 [details]
SOS report of DL580G5 with 256GB
This is using RHEL 5.1 x64 base media only.
Can you please describe exactly what you're seeing with the new kernel? I
believe we're seeing something different. Under -53.el5, we saw the
following in 'xm dmesg':
(XEN) WARNING: Only the first 166 GB of the physical memory map can be
(XEN) by compatibility mode guests. Truncating the memory map...
(XEN) System RAM: 169212MB (173274008kB)
However with -75.el5, we don't see the warning, and it looks like the
system has far less memory in it.
Can you attach a sosreport from the system running -75.el5 (or better yet,
Beta Snapshot 1)?
Internal Status set to 'Waiting on Customer'
Status set to: Waiting on Client
This event sent from IssueTracker by dwa
When I run using Snapshot 1 the system will get mostly through the boot
(XEN) Xen is relinquishing VGA console
I then lose output to my monitor (above is the last thing displayed on the
screen). The serial output I provided is once the system gets to this point, I
then log in via a serial cable. The system is in the hypervisor kernel. Am I
stuck here or is there a way to get to bash?
The system shows 256GB using the RHEL 5.2 Snapshot 3. Alt sysrq M shows all
memory. /proc/meminfo shows all memory. HTS memory test passes as well.
fixed in kernel-2.6.18-87.el5 (Snapshot 3)
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.