Xen Project Release Features

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Xen 4.0 Xen 4.1
Initial Release 7 April 2010 25 March 2011
Host Limits
Physical CPUs 128 [ 1 ] >255
RAM 1TB
Guest Limits
Virtual CPUs 128
RAM (PV guest) 512GB
RAM (HVM guest) 1TB
Toolstack
xend / xm
XL Initial implementation Preview release
Features
Blktap2
PCI Passthrough
[[1]] -- Transcendent Memory [ 2 ] [ 2 ]
gdbsx
debugger to debug ELF guests
Memory Sharing [ 3 ] [ 3 ]
Online resize of virtual disks
Remus Fault Tolerance
Physical CPU Hotplug
Physical Memory Hotplug
Support for PV kernels in bzImage format
Credit 2 Scheduler
designed for latency-sensitive workloads and very large systems.
[ 4 ]
1GB/2MB super page support
x86 Advanced Vector eXtension (AVX)
cpupool
advanced partitioning
PyGrub
Support for GRUB 2
Support for /boot on ext4

[ 1 ] Compile time limit, can be increased
[ 2 ] Disabled as a default (enable with hypervisor command line option)
[ 3 ] Initial implementation (tech preview)
[ 4 ] Prototype