On Sun, 2008-05-04 at 15:21 -0500, Anthony Liguori wrote: > Normally, tap always reads packets and simply lets the client drop them if it > cannot receive them. For virtio-net, this results in massive packet loss and > about an 80% performance loss in TCP throughput. > > This patch modifies qemu_send_packet() to only deliver a packet to a VLAN > client if it doesn't have a fd_can_read method or the fd_can_read method > indicates that it can receive packets. We also return a status of whether > any clients were able to receive the packet. > > If no clients were able to receive a packet, we buffer the packet until a > client indicates that it can receive packets again. > > This patch also modifies the tap code to only read from the tap fd if at least > one client on the VLAN is able to receive a packet. > > Finally, this patch changes the tap code to drain all possible packets from > the tap device when the tap fd is readable. > > Signed-off-by: Anthony Liguori <[EMAIL PROTECTED]>
Patchset looks good and reduces some nasty hacks. It probably also improves other devices like e1000 et al. Cheers, Dor ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
