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From 0c94ea5029040ce3ab83c498db9b4ffb69d0e18a Mon Sep 17 00:00:00 2001
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Message-Id: <0c94ea5029040ce3ab83c498db9b4ffb69d0e18a@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Tue, 4 Mar 2014 11:11:24 +0100
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Subject: [PATCH] qemuBuildNicDevStr: Adapt to new advisory on multiqueue
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https://bugzilla.redhat.com/show_bug.cgi?id=1071888
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As I did previously in 4f588a1b46, libvirt needs to set virtio vectors.
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Previously, we were advised to use vectors=N, where
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N = 2 * (number of queues) + 1
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However, just recently this advisory has changed on the Multiquue wiki
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page [1] to:
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N = 2 * (number of queues) + 2
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1: http://www.linux-kvm.org/page/Multiqueue#Enable_MQ_feature
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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(cherry picked from commit 042c4ab1c933ef45012b703b5cbd776422f491c8)
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/qemu/qemu_command.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
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index 54c36e3..4d4474c 100644
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--- a/src/qemu/qemu_command.c
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+++ b/src/qemu/qemu_command.c
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@@ -4904,8 +4904,8 @@ qemuBuildNicDevStr(virDomainDefPtr def,
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}
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if (usingVirtio && vhostfdSize > 1) {
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/* As advised at http://www.linux-kvm.org/page/Multiqueue
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- * we should add vectors=2*N+1 where N is the vhostfdSize */
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- virBufferAsprintf(&buf, ",mq=on,vectors=%d", 2 * vhostfdSize + 1);
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+ * we should add vectors=2*N+2 where N is the vhostfdSize */
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+ virBufferAsprintf(&buf, ",mq=on,vectors=%d", 2 * vhostfdSize + 2);
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}
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if (vlan == -1)
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virBufferAsprintf(&buf, ",netdev=host%s", net->info.alias);
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--
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1.9.0
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