On Friday 19 October 2012 15:27:52 m.roth@5-cent.us wrote:
Tim Nelson wrote:
----- Original Message -----
On Thursday 18 October 2012 21:44:30 Tim Nelson wrote:
I see this ocasionally on one of my CentOS 6.3 x64 systems:
Oct 18 03:10:52 backup kernel: swapper: page allocation failure. order:1, mode:0x20 Oct 18 03:10:52 backup kernel: Pid: 0, comm: swapper Not tainted 2.6.32-279.9.1.el6.x86_64 #1 Oct 18 03:10:52 backup kernel: Call Trace: Oct 18 03:10:52 backup kernel: <IRQ> [<ffffffff8112789f>] ? __alloc_pages_nodemask+0x77f/0x940 Oct 18 03:10:52 backup kernel:
<snip>
Any thoughts on the cause? The system has 16GB of RAM, and whenever checked, there is no swap usage. Is this a memory error (bad RAM)?
I have the same problem on a Dell PE R720 with 16GB of RAM doing lots of networking. It's a file server. It was discussed on the dell-poweredge mailing list last week linux-poweredge@dell.com
The conclusion was that it was harmless but for a discussion and possible workaround see https://bugzilla.redhat.com/show_bug.cgi?id=770545#c16
Hope this helps,
Thanks, but I agree with the person in the bugzilla thread, this is not "just harmless" - when I see one in the logs, I usually see several within a single hour. I *think* that it seems to happen more when someone's copying or d/l large datasets, and it makes me extrememly worried about the consistency of the data.
Agree it happens when there is a lot of network activity. My box during the day is a student fileserver and at night it does backups using BackupPC so a lot of network activity. I haven't seen any ill-effects but would obviously be happy to get it sorted. I tried the workaround suggested in the bugzilla thread so I'll see if it has any effect.
Tony
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