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qemuBuildNicDevStr: Adapt to new advisory on multiqueue

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As I did previously in 4f588a1b46, libvirt needs to set virtio vectors.
Previously, we were advised to use vectors=N, where

N = 2 * (number of queues) + 1

However, just recently this advisory has changed on the Multiquue wiki
page [1] to:

N = 2 * (number of queues) + 2

1: http://www.linux-kvm.org/page/Multiqueue#Enable_MQ_feature

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Michal Privoznik 2014-03-04 10:33:46 +01:00
parent 12ee0b98d3
commit 042c4ab1c9
1 changed files with 2 additions and 2 deletions
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src/qemu/qemu_command.c
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@ -5036,8 +5036,8 @@ qemuBuildNicDevStr(virDomainDefPtr def,
}
if (usingVirtio && vhostfdSize > 1) {
/* As advised at http://www.linux-kvm.org/page/Multiqueue
* we should add vectors=2*N+1 where N is the vhostfdSize */
virBufferAsprintf(&buf, ",mq=on,vectors=%d", 2 * vhostfdSize + 1);
* we should add vectors=2*N+2 where N is the vhostfdSize */
virBufferAsprintf(&buf, ",mq=on,vectors=%d", 2 * vhostfdSize + 2);
}
if (vlan == -1)
virBufferAsprintf(&buf, ",netdev=host%s", net->info.alias);