carlopmart wrote: > Steven Ellis wrote: > >> carlopmart wrote: >> >>> Hi all, >>> >>> I order to reach maximum performance on my centos kvm hosts I have use these params: >>> >>> - On /etc/grub.conf: >>> >>> kernel /vmlinuz-2.6.18-164.11.1.el5 ro root=LABEL=/ elevator=deadline quiet >>> >>> - On sysctl.conf >>> >>> # Special network params >>> net.core.rmem_default = 8388608 >>> net.core.wmem_default = 8388608 >>> net.core.rmem_max = 16777216 >>> net.core.wmem_max = 16777216 >>> net.ipv4.tcp_rmem = 1048576 4194304 16777216 >>> net.ipv4.tcp_wmem = 1048576 4194304 16777216 >>> >>> >>> # Disable netfilter on bridges. >>> net.bridge.bridge-nf-call-ip6tables = 0 >>> net.bridge.bridge-nf-call-iptables = 0 >>> net.bridge.bridge-nf-call-arptables = 0 >>> >>> # Virtual machines special kernel params >>> vm.swappiness = 0 >>> >>> >> Care to explain some of your choices. >> >> In particular why >> >> vm.swappiness = 0 >> >> and why elevator=deadline over noop. >> >> Steve >> >> > > I use elevator=deadline on kvm host. Under kvm guests I use elevator=noop ... > I agree with these settings > vm.swappiness is heredated from vmware installations. Is it wrong?? > I don't know. I haven't done enough performance tests. Anyone else care to comment? Steve