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
Do I need to configure something more?? Any tips??
Thanks.
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
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 ...
vm.swappiness is heredated from vmware installations. Is it wrong??
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
-
carlopmart -
Steven Ellis