<div dir="ltr"><div>Hi guys<br><br></div><div>I'm using Oracle Linux Server release 6.4 with UEK kernel 2.6.39-400.209.1.el6uek.x86_64.<br><br></div><div>I saw in config file of the kernel that UEK does not use trasparent huge page.<br><br># CONFIG_TRANSPARENT_HUGEPAGE is not set<br><br></div><div>This is not a issue for me as I'm running Oracle RAC and I could not use it anyway :)<br><br></div><div>My current setting kernel setting for RAC are provided using the oracle package 'oracle-rdbms-server-11gR2-preinstall-1.0-7.el6.x86_64' + some additional conf added manually <br><br>net.ipv4.ip_forward = 0<br>net.ipv4.conf.default.rp_filter = 0<br>net.ipv4.conf.default.accept_source_route = 0<br>kernel.sysrq = 0<br>kernel.core_uses_pid = 1<br>net.ipv4.tcp_syncookies = 1<br>net.bridge.bridge-nf-call-ip6tables = 0<br>net.bridge.bridge-nf-call-iptables = 0<br>net.bridge.bridge-nf-call-arptables = 0<br>kernel.msgmnb = 65536<br>kernel.msgmax = 65536<br>fs.file-max = 6815744<br>kernel.sem = 250 32000 100 128<br>kernel.shmmni = 4096<br>kernel.shmall = 1073741824<br>kernel.shmmax = 4398046511104<br>net.core.rmem_default = 262144<br>net.core.rmem_max = 4194304<br>net.core.wmem_default = 262144<br>net.core.wmem_max = 1048576<br>fs.aio-max-nr = 1048576<br>net.ipv4.ip_local_port_range = 9000 65500<br>vm.swappiness=0<br>vm.max_map_count=524280<br>vm.min_free_kbytes=512000<br>vm.nr_hugepages=5389<br><br></div><div>I'm having an high usage of memory but I was not able to identify the processes/cache/buffer with high usage<br><br></div><div><br></div><div><br>MemTotal: 16330600 kB<br>MemFree: 936424 kB<br>Buffers: 3996 kB<br>Cached: 595708 kB<br>SwapCached: 835748 kB<br>Active: 1931588 kB<br>Inactive: 1204540 kB<br>Active(anon): 1717000 kB<br>Inactive(anon): 993436 kB<br>Active(file): 214588 kB<br>Inactive(file): 211104 kB<br>Unevictable: 325580 kB<br>Mlocked: 325580 kB<br>SwapTotal: 18870268 kB<br>SwapFree: 17368004 kB<br>Dirty: 1696 kB<br>Writeback: 0 kB<br>AnonPages: 2855972 kB<br>Mapped: 221064 kB<br>Shmem: 93984 kB<br>Slab: 464292 kB<br>SReclaimable: 51728 kB<br>SUnreclaim: 412564 kB<br>KernelStack: 6600 kB<br>PageTables: 131396 kB<br>NFS_Unstable: 0 kB<br>Bounce: 0 kB<br>WritebackTmp: 0 kB<br>CommitLimit: 21517232 kB<br>Committed_AS: 7045840 kB<br>VmallocTotal: 34359738367 kB<br>VmallocUsed: 359380 kB<br>VmallocChunk: 34359321188 kB<br>HardwareCorrupted: 0 kB<br>HugePages_Total: 5389<br>HugePages_Free: 1086<br>HugePages_Rsvd: 1076<br>HugePages_Surp: 0<br>Hugepagesize: 2048 kB<br>DirectMap4k: 10240 kB<br>DirectMap2M: 16766976 kB<br><br></div><div>I was wondering if could be relate to the hugepage settings.<br><br>5389 x 2M = ~11G on a system with 15G of ram<br></div><div><br></div><div>Is all the space (in my case 11G) reserved at boot time or it is reserved based on the need ? <br></div><br clear="all"><div><div><div><div class="gmail_signature">Regards,<br>Marco<br></div></div>
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