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add virtio-net multiqueue support

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this a new option queue=(\d+) to net interface

Allow to use more than 1 cpu for network stream, so this can improve network bandwidth,
when vhost-net cpu is the bottleneck

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

-netdev tap,vhost=on,queues=N -device virtio-net-pci,mq=on,vectors=2N+2

host requirement
----------------
this require host kernel >= 3.8 (or qemu die at start)

linux guest requirement
-----------------------
kernel >= 3.8

manual enabling multiqueue

windows guest requierement
--------------------------
recent virtio-net driver

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
This commit is contained in:
Alexandre Derumier 2014-06-10 08:30:31 +02:00 committed by Dietmar Maurer
parent 5881b913c0
commit a9410357d2
1 changed files with 16 additions and 3 deletions
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19
PVE/QemuServer.pm
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@ -478,7 +478,7 @@ my $nic_model_list_txt = join(' ', sort @$nic_model_list);
my $netdesc = {
optional => 1,
type => 'string', format => 'pve-qm-net',
typetext => "MODEL=XX:XX:XX:XX:XX:XX [,bridge=<dev>][,rate=<mbps>][,tag=<vlanid>][,firewall=0|1]",
typetext => "MODEL=XX:XX:XX:XX:XX:XX [,bridge=<dev>][,queues=<nbqueues>][,rate=<mbps>][,tag=<vlanid>][,firewall=0|1]",
description => <<EODESCR,
Specify network devices.
@ -1190,6 +1190,11 @@ sub print_netdevice_full {
my $extra = ($bootorder !~ m/n/) ? "romfile=," : '';
my $pciaddr = print_pci_addr("$netid", $bridges);
my $tmpstr = "$device,${extra}mac=$net->{macaddr},netdev=$netid$pciaddr,id=$netid";
if ($net->{queues} && $net->{queues} > 1 && $net->{model} eq 'virtio'){
#Consider we have N queues, the number of vectors needed is 2*N + 2 (plus one config interrupt and control vq)
my $vectors = $net->{queues} * 2 + 2;
$tmpstr .= ",vectors=$vectors,mq=on";
}
$tmpstr .= ",bootindex=$net->{bootindex}" if $net->{bootindex} ;
return $tmpstr;
}
@ -1215,11 +1220,17 @@ sub print_netdev_full {
my $vmname = $conf->{name} || "vm$vmid";
my $netdev = "";
if ($net->{bridge}) {
return "type=tap,id=$netid,ifname=${ifname},script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown$vhostparam";
$netdev = "type=tap,id=$netid,ifname=${ifname},script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown$vhostparam";
} else {
return "type=user,id=$netid,hostname=$vmname";
$netdev = "type=user,id=$netid,hostname=$vmname";
}
$netdev .= ",queues=$net->{queues}" if ($net->{queues} && $net->{model} eq 'virtio');
return $netdev;
}
sub drive_is_cdrom {
@ -1273,6 +1284,8 @@ sub parse_net {
$res->{macaddr} = $mac;
} elsif ($kvp =~ m/^bridge=(\S+)$/) {
$res->{bridge} = $1;
} elsif ($kvp =~ m/^queues=(\d+)$/) {
$res->{queues} = $1;
} elsif ($kvp =~ m/^rate=(\d+(\.\d+)?)$/) {
$res->{rate} = $1;
} elsif ($kvp =~ m/^tag=(\d+)$/) {