From: "Michael S. Tsirkin" <mst@xxxxxxxxxx> Date: Thu, 1 Nov 2012 21:16:17 +0200 > > tun supports zero copy transmit since 0690899b4d4501b3505be069b9a687e68ccbe15b, > however you can only enable this mode if you know your workload does not > trigger heavy guest to host/host to guest traffic - otherwise you > get a (minor) performance regression. > This patchset addresses this problem by notifying the owner > device when callback is invoked because of a data copy. > This makes it possible to detect whether zero copy is appropriate > dynamically: we start in zero copy mode, when we detect > data copied we disable zero copy for a while. > > With this patch applied, I get the same performance for > guest to host and guest to guest both with and without zero copy tx. Series applied, thanks Michael. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
