Date: Fri, 12 Sep 2003 15:05:15 +0200 From: Marko Zec <zec@tel.fer.hr> To: net@freebsd.org, stable@freebsd.org Subject: New snapshot: network stack cloning / virtualization patches Message-ID: <200309121505.15651.zec@tel.fer.hr>
next in thread | raw e-mail | index | archive | help
Network stack cloning patches allow for multiple fully independent network stacks to simultaneously coexistst in a single FreeBSD kernel. Combined with jail-style separation between user processes and with proportional-share extensions to the standard BSD CPU scheduler, the patched kernel can efficiently provide isolated and controllable pseudo virtual machine environments. The patches preserve the userland to kernel API/ABI, so all existing applications can run on the patched kernel without any need for modifications / recompiling. The latest snapshot of the patches (against 4.8-RELEASE) can be found at http://www.tel.fer.hr/zec/vimage/ What's new: Internal restructuring - struct vimage is now separated in resource-specific containers for network stack (vnet), jail-style process group (vprocg), and CPU scheduling (vcpu). This should allow for more modular resource virtualization in the future, however the necessary management API has yet to be implemented; Kernel message buffers - each vimage / vprocg now has a private kernel message buffer instance, thus allowing for (virtualized) printf() and log() messages from within the kernel to be routed to the appropriate msgbuf. The /dev/log interface has been hacked to support for multiple syslogd instances to access it simultaneously, while each receiving only the messages from the appropriate msgbuf instance; Several important bugfixes in TCP code virtualization. Cheers, Marko
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200309121505.15651.zec>