From: Tharindu Rukshan Bamunuarachchi <btharindu@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Hugh Dickins <hughd@google.com>, linux-mm@kvack.org
Subject: Re: TMPFS Maximum File Size
Date: Thu, 28 Oct 2010 19:05:33 +0530 [thread overview]
Message-ID: <AANLkTikX2LkCfEAuJAaWJ5FsWC25mkQi2qLCSe=L=4q1@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1010271503360.6255@router.home>
Dear Hugh/Christoph/All,
I have done further testing to isolate the issue & found following.
1. At the moment .... Issue only occurs with IBM hardware. (x3550/x3650).
It did not occur in HP Nehalem or Sun X4600. I have only IBM/HP/Sun boxes.
2. Issue is not visible with vanilla kernel 2.6.32 or 2.6.36.
SLES 11 is running with 2.6.27-45. I think I should turn to IBM/Novell
for further help.
I still wonder why this happens only with IBM+SLES 11 kernel ? Same HW
works with later kernels ?
__
Tharindu R Bamunuarachchi.
On Thu, Oct 28, 2010 at 1:38 AM, Christoph Lameter <cl@linux.com> wrote:
>
> On Tue, 26 Oct 2010, Tharindu Rukshan Bamunuarachchi wrote:
>
> > I have two node NUMA system and 100G TMPFS mount.
> >
> > 1. When "dd" running freely (without CPU affinity) all memory pages
> > were allocated from NODE 0 and then from NODE 1.
> >
> > 2. When "dd" running bound (using taskset) to CPU core in NODE 1 ....
> > All memory pages were allocated from NODE 1.
> > BUT machine stopped responding after exhausting NODE 1.
> > No memory pages were allocated from NODE 0.
>
> Hmmm... Strange it should fall back like under #1. Can you tell us where
> it hung?
>
> > Do you have any comment / suggestions to try out ?
> > Why "dd" cannot allocate memory from NODE 0 when it is running bound
> > to NODE 1 CPU core ?
>
> Definitely looks like a bug somewhere. TMPFS policies are not correctly
> falling over to more distant zones?
>
> > Core was generated by `DataWareHouseEngine Surv:1:1:DataWareHouseEngine:1'.
> > Program terminated with signal 11, Segmentation fault.
> > #0 0x00007fd924b0cf7c in write () from /lib64/libc.so.6
>
> Hmmm... Kernel oops? Or a segfault because of an invalid reference by your
> app?
>
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next prev parent reply other threads:[~2010-10-28 13:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-20 13:44 TMPFS Maximum File Size Tharindu Rukshan Bamunuarachchi
2010-10-20 14:14 ` Christoph Lameter
2010-10-20 16:57 ` Hugh Dickins
2010-10-26 13:55 ` Tharindu Rukshan Bamunuarachchi
2010-10-27 3:44 ` Hugh Dickins
2010-10-27 20:08 ` Christoph Lameter
2010-10-28 13:35 ` Tharindu Rukshan Bamunuarachchi [this message]
2010-10-28 13:49 ` Christoph Lameter
2010-10-29 2:01 ` Tharindu Rukshan Bamunuarachchi
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