From mboxrd@z Thu Jan 1 00:00:00 1970 From: Asias He Subject: [PATCH 2/2] kvm tools: Respect VRING_AVAIL_F_NO_INTERRUPT Date: Sat, 7 May 2011 10:34:20 +0800 Message-ID: <1304735660-10844-2-git-send-email-asias.hejun@gmail.com> References: <1304735660-10844-1-git-send-email-asias.hejun@gmail.com> Cc: kvm@vger.kernel.org, Asias He To: Pekka Enberg , Cyrill Gorcunov , Ingo Molnar , Sasha Levin , Prasad Joshi Return-path: Received: from mail-pz0-f46.google.com ([209.85.210.46]:34598 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754067Ab1EGCf5 (ORCPT ); Fri, 6 May 2011 22:35:57 -0400 Received: by pzk9 with SMTP id 9so1667050pzk.19 for ; Fri, 06 May 2011 19:35:56 -0700 (PDT) In-Reply-To: <1304735660-10844-1-git-send-email-asias.hejun@gmail.com> Sender: kvm-owner@vger.kernel.org List-ID: Do not inject IRQ when guest suppress it. This can reduce IRQ injection further and bumps host to guest bandwitdh to 6178.78 Mbps(cpu 63.96%). Signed-off-by: Asias He --- tools/kvm/virtio/core.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/tools/kvm/virtio/core.c b/tools/kvm/virtio/core.c index 0734984..2b3503d 100644 --- a/tools/kvm/virtio/core.c +++ b/tools/kvm/virtio/core.c @@ -60,6 +60,9 @@ u16 virt_queue__get_iov(struct virt_queue *queue, struct iovec iov[], u16 *out, void virt_queue__trigger_irq(struct virt_queue *vq, int irq, u8 *isr, struct kvm *kvm) { + if (vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT) + return; + if (*isr == VIRTIO_IRQ_LOW) { *isr = VIRTIO_IRQ_HIGH; kvm__irq_line(kvm, irq, VIRTIO_IRQ_HIGH); -- 1.7.4.4