On 11/24/10 3:59 PM, mcclnx mcc wrote: > we just installed CENTOS 5.5 X86 (32 bits) on DELL server. After installed we also apply lated O.S. patches. > > This server have 64 GB RAM and run "2.6.18-194.26.1.el5PAE #1 SMP ". when I doing "cp", "mv". "ftp", .... it continue "kill" my process and pop up "out of memory" on /var/log/messages: > > ... > > any one know why? > > Is CENTOS X86 5..5 really NOT stable version? no, using 32 bit PAE with 64GB of memory means your page tables are using ALL of the available 1GB kernel address space available. the 32 bit kernel chokes itself under these extreme conditions. this is an architectural feature of the Intel x86, the "solution" is 64 bit mode where the page tables and kernel and a user process don't all have to fit into 4GB of address space.