Linus 正式宣布Linux Kernel 3.0 版本正式發布。
新功能有：

‧Btrfs：實現自動碎片整理、資料校驗和檢查，並且提升了部分性能。
‧新增sendmmsg()：提升約UDP 發送性能20%，接口發送性能30%。
‧XEN dom0 支援。
‧增加 Cleancache 支援，
‧Berkeley 即時包過濾器，配合libpcap/tcpdump 提升包過濾規則的運行效率。
‧支持通過 WLAN 喚醒。
‧實現非特殊授權的ICMP_ECHO (ping 命令)。
‧setns() syscall 更好的命令空間處理。
‧新增Alarm-timers，具有高精度計時器的特點，但是可以在通過RFC 設備喚醒掛起狀態的系統。

Summary: Besides a new version numbering scheme, Linux 3.0 also has several new features: Btrfs data scrubbing and automatic defragmentation, XEN Dom0 support, unprivileged ICMP_ECHO, wake on WLAN, Berkeley Packet Filter JIT filtering, a memcached-like system for the page cache, a sendmmsg() syscall that batches sendmsg() calls and setns(), a syscall that allows better handling of light virtualization systems such as containers. New hardware support has been added: for example, Microsoft Kinect, AMD Llano Fusion APUs, Intel iwlwifi 105 and 135, Intel C600 serial-attached-scsi controller, Ralink RT5370 USB, several Realtek RTL81xx devices or the Apple iSight webcam. Many other drivers and small improvements have been added.
1.Prominent features
1.Btrfs: Automatic defragmentation, scrubbing, performance improvements
2.sendmmsg(): batching of sendmsg() calls
3.XEN dom0 support
4.Cleancache
5.Berkeley Packet Filter just-in-time filtering
6.Wake on WLAN support
7.Unprivileged ICMP_ECHO messages
8.setns() syscall: better namespace handling
9.Alarm-timers
2.Driver and architecture-specific changes
3.VFS
4.Process scheduler
5.Memory management
6.Networking
7.File systems
8.Crypto
9.Virtualization
10.Security
11.Tracing/profiling
12.Various core changes