>Hi, > >I have setup a TUN/TAP device in my QEMU-KVM setup, and when I try to >download a 1G file from the guest VM on a 1Gbit network, the download >speed is abysmal (3MB/sec). Do I need to setup the QEMU acceleration for >achieving better speeds ? What is the status of para virtualized >networking on guests ?
3MB is the expected rate of the ne2k device model. You can achieve 5MB with model=rtl8139. There is a chance that kqemu will do a little better because the overhead is caused by extensive port io or MMIO. With KVM vmexit are probably a more expensive than doing MMIO in qemu and going back to the kqemu kernel module. Although usually KVM beats Kqemu on most cases. PV network driver for Linux exists but not on the master branch. The current performance is about 55MBps :) It will be merged in 1-2 weeks with the main branch. The performance expects to increase up to very close to native. > >Thanks, >Pradeep > > >----------------------------------------------------------------------- -- >Take Surveys. Earn Cash. Influence the Future of IT >Join SourceForge.net's Techsay panel and you'll get the chance to share >your >opinions on IT & business topics through brief surveys-and earn cash >http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVD EV >_______________________________________________ >kvm-devel mailing list >kvm-devel@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/kvm-devel ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
