Am 28.02.2014 09:27, schrieb Anton Ivanov (antivano): > Hi Richard, Hi Jeff, hi list, > > On behalf of Cisco systems, I am authorized to make a offer a set bug > fixes as well as contribute several additional features and performance > improvements to UML. All of these have been used internally for a couple > of years and will ship as parts of product(s) in the near future. Some > of these improve performance by up to 8 times on use cases which are of > interest to us and are likely to be of interest to the community. > > As the full patchset is now in the 100k+ zone, so I am going to do only > the announcement now and submit the patches one by one after that over > the next 1-2 weeks. > > We will submit separately bug fixes for: > > 1. Critical memory corruption on startup observed on heavily loaded > machines (especially when multiple UMLs run simultaneously). > 2. Fix(es) for incorrect handling of error conditions when UML is run > under expect and conX=fd: is used to communicate with another process. > The same error may be observed on internal UML IPCs too leading to > immediate crash. > > I will also file bugs for both vs Debian UML package so that patches for > both can go in ASAP. > > In addition to the bug fixes, the new features include: > > 1. Several transports. All can do up to multi-gigabit throughput on some > scenarios. We are contributing their counterparts to qemu/kvm as well. > > 1.1. Direct connection of UML to overlay networks/L2 VPNs using L2TPv3. > > This has a number of advantages compared to the existing UML "multicast" > and qemu "socket" transports. > > * Standard compliant - RFC 3931 updated recently by RFC 5641 > * Supported on most network equipment > * Allowing to move virtual switching off-host to an NPU or high > performance physical switch > * Allowing to mix virtual and physical switching (well supported on > modern Linuxes and other OSes) > * Well researched security profile as well as established > interactions with IPSEC allowing to extend virtual networks outside the > datacenter to remote physical devices and/or VMs. > > 1.2. Raw transport which allows both bi-directional communication with > any network device which looks like Ethernet as well as in-span > listening at speeds in the multi-gigabit range. > > 1.3. We intend to contribute other key overlay transports like GRE, etc > as well. The ones we are contributing at this point are the ones which > we have used most extensively and have had the most testing (~ 1.5-2 years). > > 2. New high res timer subsystem > > Adding these new network transports to UML revealed a key issue - it > cannot meter or shape any traffic correctly as its internal timer system > is way off. Personally, I consider it a bug, however there is no "easy" > fix here. The only way to fix it is a new timer driver. Unfortunately, > it does not fix uml userspace - timers there remain off. It does fix all > kernel timer functionality - traffic shaping (both qdisc and iptables > traffic limits). > > As a side effect, this provides performance improvements for tcp and > other protocols which rely on kernel high res timers for their state > machines. > > We have further scalability contributions lined up which improve network > and IO performance between 1.5 and 8 times (depending on use case), > allow hundreds of virtual interfaces per UML without performance > penalties, allow to run several hundreds (if not thousands) of UMLs per > machine, etc. All in all, it can no go where no virtualization and no > virtual networking has gone before. > > However, I would prefer to take it one step at a time and get through > these first (even these are quite a lot for one "sitting").
Sounds awesome! Please send the patches as soon as possible. I'm eager to test and merge them. Thanks, //richard ------------------------------------------------------------------------------ Flow-based real-time traffic analytics software. Cisco certified tool. Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer Customize your own dashboards, set traffic alerts and generate reports. Network behavioral analysis & security monitoring. All-in-one tool. http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
