NUMA page allocation from next Node

Tharindu Rukshan Bamunuarachchi <[email protected]> Tue, 26 Oct 2010 21:57:53 +0530

Newsgroups	org.kernel.vger.linux-numa
Message-ID	<[email protected]>

Dear All,

Today, we experienced abnormal memory allocation behavior.
I do not know whether this is the expected behavior or due to misconfiguration.

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 started to be allocated from NODE 1.
    BUT machine stopped responding after exhausting NODE 1.
    No memory pages were started to be allocated from NODE 0.

Why "dd" cannot allocate memory from NODE 0 when it is running bound
to NODE 1 CPU core ?

Please help.
I am using SLES 11 with 2.6.27 kernel.
__
Tharindu R Bamunuarachchi.