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: ========================================================== Nov 24 16:36:25 MCC kernel: HighMem: 1*4kB 0*8kB 1*16kB 3210*32kB 17367*64kB 4010*128kB 2497*256kB 126*512kB 2*1024kB 0*2048kB 10549*4096kB = 45642004kB Nov 24 16:36:25 MCC kernel: 4927968 pagecache pages Nov 24 16:36:25 MCC kernel: Swap cache: add 0, delete 0, find 0/0, race 0+0 Nov 24 16:36:25 MCC kernel: Free swap = 36869116kB Nov 24 16:36:25 MCC kernel: Total swap = 36869116kB Nov 24 16:36:25 MCC kernel: Free swap: 36869116kB Nov 24 16:36:25 MCC kernel: 16777216 pages of RAM Nov 24 16:36:25 MCC kernel: 16547840 pages of HIGHMEM Nov 24 16:36:25 MCC kernel: 362985 reserved pages Nov 24 16:36:25 MCC kernel: 3334251 pages shared Nov 24 16:36:25 MCC kernel: 0 pages swap cached Nov 24 16:36:25 MCC kernel: 839171 pages dirty Nov 24 16:36:25 MCC kernel: 2 pages writeback Nov 24 16:36:25 MCC kernel: 3528 pages mapped Nov 24 16:36:25 MCC kernel: 59119 pages slab Nov 24 16:36:25 MCC kernel: 584 pages pagetables Nov 24 16:36:25 MCC kernel: Out of memory: Killed process 5114, UID 81, (dbus-daemon). Nov 24 16:37:11 MCC gpm[5531]: *** info [client.c(137)]: Nov 24 16:37:11 MCC gpm[5531]: Connecting at fd 6 =================================================== any one know why? Is CENTOS X86 5..5 really NOT stable version? Thanks.