Hi Patrick, > > Handling loadbalancing in softirq corner is, IMHO, not the best place > > for performance. Softirq handling design become a performance bottlneck > > catalysed by the democratization of SMP (multi-core) box. There is > > alternative design but need to find time to work fulltime on this (I > > have this on my TODO). > > The speed of a single core is just too slow. Balancing the interrupts > over multiple CPU cores gives a performance penalty. > > What about MSI-X with multiqueue (like intel chipset 82575). Will that > help. I haven't found a nic with that chipset yet, but that's a different > story.
multi-rx/tx queue is great if supported by NIC driver you are using. for example the ixgb driver is supporting multiqueue handling. But with a simple rework of the softirq design you can have a huge performance gain. I mean, skb are coming from netdev and directly queued into multi-lvs-queue which job is to drive loadbalancing decision + skb gardening, this queue is fetched by dedicated kthread, so your netdev only fill skb into the queue while kthread unqueue/handle. With this simple code extension you will have a nice gain. IMHO, multiqueue is great design and is legitimate by NIC bandwidth, I mean, for 10GE NIC. Regards, Alexandre _______________________________________________ LinuxVirtualServer.org mailing list - [email protected] Send requests to [EMAIL PROTECTED] or go to http://lists.graemef.net/mailman/listinfo/lvs-users
