Hello all, We''re trying to move a farm of ancient physicals to VMs and experiencing some network issues. The network problems are usually seen as TCP retransmits due to bad chksum and now we''re seeing complete halt to network traffic (just to that VM, not the other residents) for ~10 minutes. The characteristics of the VM experiencing the problems; 2700 sockets always open, 32bit app, 4 vcpus, Linux. Using the network tuning guide on the wiki; I''ve messed with TCP offloading, various network params (no affect), and setting the affinity of the app to other than CPU0. I''ve also tried openvswitch, that was brought to its knees so I''m back on linux bridge. 4 dom0 vcpus, one netback process at an avg. of 40%. Anybody have experience with large number of sockets? Or tried this: http://sourceforge.net/projects/xvmsocket/ I think I could configure my VM setup to accommodate it. Thanks in advance, John Eisenhower
Am Freitag, 26. April 2013, 21:34:52 schrieb John:> The characteristics of the VM experiencing the problems; 2700 > sockets always open, 32bit app, 4 vcpus, Linux.Did you experience the same with target / source machines outside your xen setup (means - are you shure that the problems depends from xen here)? How many IP addresses do you have within your DomU xennet interfaces? How many interfaces? What version(s) of xen and DomU kernels you are using? I''ve run into similiar problems on NetBSD 4 some years ago where i''ve runned out of nmbclusters with a very similiar effect to me. Not shure if that wold help you here...> Anybody have experience with large number of sockets? Or tried this: > http://sourceforge.net/projects/xvmsocket/ I think I could configure my > VM setup to accommodate it.hmm, this is new to me - if that concept would work "transparently" for ("accelerating") usual/standard TCP/IP sockets on linux guests this sounds like a "must" for many xen users - but if i understand right this will bring up some own/new special socket type for usage with applications using this type of new sockets? cheers, Niels. -- --- Niels Dettenbach Syndicat IT & Internet http://www.syndicat.com PGP: https://syndicat.com/pub_key.asc --- _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users