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KVM Optimisation

KVM Optimisations

transmit queue virsh domiflist # this is then the txqueuelen change below ??? # changing to 4096 ifconfig txqueuelen txqueuelen (iwbcman comment) defaults to 1000, apparently 200 is good ip link set eth0 txqueuelen 200 vim /etc/network/interfaces add post-up /sbin/ip link set eth0 txqueuelen 200 to the end If virtual hdd is slow can try Cache mode: none (not default!) I/O mode: native https://unix.stackexchange.com/a/48584 non caching on dirves? https://blog.jdpfu.com/2012/07/30/improving-kvm-performance ://documentation.suse.com/smart/linux/html/concept-virtual-disk-cache-modes/concept-virtual-disk-cache-modes.html#:~:text=A%20disk%20cache%20is%20a,example%2C%20by%20setting%20its%20type. On VM turning cache off essentially acts like accessing the drive itself. No exactly a passthrough, but decent enough http://www.linux-kvm.org/page/Tuning_KVM