Dor Laor wrote:
From f244bcad756c4f761627557bb7f315b1d8f22fb2 Mon Sep 17 00:00:00 2001 From: Dor Laor <dor.laor@xxxxxxxxxxxx> Date: Thu, 20 Dec 2007 13:26:30 +0200 Subject: [PATCH] [VIRTIO-NET] Rx performance improvement The current performance are not good enough, the problem lies in qemu tap handling code that caused to pass packets one at a time and also to copy them to a temporal buffer. This patch prevents qemu handlers from reading the tap and instead it selects the tap descriptors for virtio devices. This eliminates copies and also batch guest notifications (interrupts). Using this patch the rx performance reaches 800Mbps. The patch does not follow qemu's api since the intention is first to have a better io in kvm and then to polish it correctly.
This breaks -net user, which is one of the motivations for having a qemu net device. We need to maintain the old path for that, and only use the new fast path if using -net tap.
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