* [pve-devel] [PATCH qemu-server] cfg2cmd: netdev: fix value for tx_queue_size
@ 2023-07-11 10:57 Fiona Ebner
2023-07-11 13:52 ` DERUMIER, Alexandre
0 siblings, 1 reply; 2+ messages in thread
From: Fiona Ebner @ 2023-07-11 10:57 UTC (permalink / raw)
To: pve-devel
Quoting from QEMU commit 4271f40383 ("virtio-net: correctly report
maximum tx_queue_size value"):
> Maximum value for tx_queue_size depends on the backend type.
> 1024 for vDPA/vhost-user, 256 for all the others.
> So the parameter is silently ignored and ethtool reports a different
> value than the one provided by the user.
Indeed, for a non-vDPA/vhost-user netdev, the guest will see TX: 256
instead of the specified 1024 here. With the mentioned QEMU commit (in
master and will be part of 8.1), using 1024 will be a hard error:
> Invalid tx_queue_size (= 1024), must be a power of 2 between 256 and 256
Since neither vhost-user, nor vhost-vdpa netdev types are exposed by
Proxmox VE, just changing the limit to the correct 256 should be fine.
No obvious issue during live-migration found.
Fixes: 620d6b32 ("virtio-net: increase defaults rx|tx-queue-size to 1024")
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---
@Alexandre: in the commit message of 620d6b32 ("virtio-net: increase
defaults rx|tx-queue-size to 1024") you talk about DPDK, but isn't
vhost-user required for that? And I didn't see where we expose
vhost-user (vhost-net is different AFAICT)?
PVE/QemuServer.pm | 2 +-
test/cfg2cmd/efidisk-on-rbd.conf.cmd | 2 +-
test/cfg2cmd/netdev-7.1-multiqueues.conf.cmd | 2 +-
test/cfg2cmd/netdev-7.1.conf.cmd | 2 +-
test/cfg2cmd/q35-linux-hostpci-mapping.conf.cmd | 2 +-
test/cfg2cmd/q35-linux-hostpci-multifunction.conf.cmd | 2 +-
test/cfg2cmd/q35-linux-hostpci-x-pci-overrides.conf.cmd | 2 +-
test/cfg2cmd/q35-linux-hostpci.conf.cmd | 2 +-
test/cfg2cmd/q35-simple.conf.cmd | 2 +-
test/cfg2cmd/qemu-xhci-7.1.conf.cmd | 2 +-
test/cfg2cmd/qemu-xhci-q35-7.1.conf.cmd | 2 +-
test/cfg2cmd/seabios_serial.conf.cmd | 2 +-
12 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 430661a7..a9e38256 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -1762,7 +1762,7 @@ sub print_netdevice_full {
}
if (min_version($machine_version, 7, 1) && $net->{model} eq 'virtio'){
- $tmpstr .= ",rx_queue_size=1024,tx_queue_size=1024";
+ $tmpstr .= ",rx_queue_size=1024,tx_queue_size=256";
}
$tmpstr .= ",bootindex=$net->{bootindex}" if $net->{bootindex} ;
diff --git a/test/cfg2cmd/efidisk-on-rbd.conf.cmd b/test/cfg2cmd/efidisk-on-rbd.conf.cmd
index 4d47586d..f02039a1 100644
--- a/test/cfg2cmd/efidisk-on-rbd.conf.cmd
+++ b/test/cfg2cmd/efidisk-on-rbd.conf.cmd
@@ -28,5 +28,5 @@
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:aabbccddeeff' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
- -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=1024,bootindex=300' \
+ -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=300' \
-machine 'type=pc+pve0'
diff --git a/test/cfg2cmd/netdev-7.1-multiqueues.conf.cmd b/test/cfg2cmd/netdev-7.1-multiqueues.conf.cmd
index d7532bd3..2c6c9054 100644
--- a/test/cfg2cmd/netdev-7.1-multiqueues.conf.cmd
+++ b/test/cfg2cmd/netdev-7.1-multiqueues.conf.cmd
@@ -22,5 +22,5 @@
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:aabbccddeeff' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on,queues=2' \
- -device 'virtio-net-pci,mac=A2:C0:43:77:08:A0,netdev=net0,bus=pci.0,addr=0x12,id=net0,vectors=6,mq=on,packed=on,rx_queue_size=1024,tx_queue_size=1024,bootindex=300,host_mtu=900' \
+ -device 'virtio-net-pci,mac=A2:C0:43:77:08:A0,netdev=net0,bus=pci.0,addr=0x12,id=net0,vectors=6,mq=on,packed=on,rx_queue_size=1024,tx_queue_size=256,bootindex=300,host_mtu=900' \
-machine 'type=pc+pve0'
diff --git a/test/cfg2cmd/netdev-7.1.conf.cmd b/test/cfg2cmd/netdev-7.1.conf.cmd
index 6f9c1776..6ffa9717 100644
--- a/test/cfg2cmd/netdev-7.1.conf.cmd
+++ b/test/cfg2cmd/netdev-7.1.conf.cmd
@@ -22,5 +22,5 @@
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:aabbccddeeff' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
- -device 'virtio-net-pci,mac=A2:C0:43:77:08:A0,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=1024,bootindex=300,host_mtu=900' \
+ -device 'virtio-net-pci,mac=A2:C0:43:77:08:A0,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=300,host_mtu=900' \
-machine 'type=pc+pve0'
diff --git a/test/cfg2cmd/q35-linux-hostpci-mapping.conf.cmd b/test/cfg2cmd/q35-linux-hostpci-mapping.conf.cmd
index 814a9021..bc48c5ae 100644
--- a/test/cfg2cmd/q35-linux-hostpci-mapping.conf.cmd
+++ b/test/cfg2cmd/q35-linux-hostpci-mapping.conf.cmd
@@ -32,5 +32,5 @@
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:aabbccddeeff' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
- -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=1024,bootindex=300' \
+ -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=300' \
-machine 'type=q35+pve0'
diff --git a/test/cfg2cmd/q35-linux-hostpci-multifunction.conf.cmd b/test/cfg2cmd/q35-linux-hostpci-multifunction.conf.cmd
index 5b7b3e4b..0b1d85af 100644
--- a/test/cfg2cmd/q35-linux-hostpci-multifunction.conf.cmd
+++ b/test/cfg2cmd/q35-linux-hostpci-multifunction.conf.cmd
@@ -32,5 +32,5 @@
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:aabbccddeeff' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
- -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=1024,bootindex=300' \
+ -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=300' \
-machine 'type=q35+pve0'
diff --git a/test/cfg2cmd/q35-linux-hostpci-x-pci-overrides.conf.cmd b/test/cfg2cmd/q35-linux-hostpci-x-pci-overrides.conf.cmd
index 6507703d..c7698d17 100644
--- a/test/cfg2cmd/q35-linux-hostpci-x-pci-overrides.conf.cmd
+++ b/test/cfg2cmd/q35-linux-hostpci-x-pci-overrides.conf.cmd
@@ -31,5 +31,5 @@
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:aabbccddeeff' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
- -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=1024,bootindex=300' \
+ -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=300' \
-machine 'type=q35+pve0'
diff --git a/test/cfg2cmd/q35-linux-hostpci.conf.cmd b/test/cfg2cmd/q35-linux-hostpci.conf.cmd
index 0fedbd2c..5289ec69 100644
--- a/test/cfg2cmd/q35-linux-hostpci.conf.cmd
+++ b/test/cfg2cmd/q35-linux-hostpci.conf.cmd
@@ -37,5 +37,5 @@
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:aabbccddeeff' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
- -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=1024,bootindex=300' \
+ -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=300' \
-machine 'type=q35+pve0'
diff --git a/test/cfg2cmd/q35-simple.conf.cmd b/test/cfg2cmd/q35-simple.conf.cmd
index ef939f28..98b22f46 100644
--- a/test/cfg2cmd/q35-simple.conf.cmd
+++ b/test/cfg2cmd/q35-simple.conf.cmd
@@ -25,5 +25,5 @@
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:aabbccddeeff' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
- -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=1024,bootindex=300' \
+ -device 'virtio-net-pci,mac=2E:01:68:F9:9C:87,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=300' \
-machine 'type=q35+pve0'
diff --git a/test/cfg2cmd/qemu-xhci-7.1.conf.cmd b/test/cfg2cmd/qemu-xhci-7.1.conf.cmd
index df4c7030..2492e57e 100644
--- a/test/cfg2cmd/qemu-xhci-7.1.conf.cmd
+++ b/test/cfg2cmd/qemu-xhci-7.1.conf.cmd
@@ -33,5 +33,5 @@
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:aabbccddeeff' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
- -device 'virtio-net-pci,mac=A2:C0:43:77:08:A1,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=1024,bootindex=300' \
+ -device 'virtio-net-pci,mac=A2:C0:43:77:08:A1,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=300' \
-machine 'type=pc+pve0'
diff --git a/test/cfg2cmd/qemu-xhci-q35-7.1.conf.cmd b/test/cfg2cmd/qemu-xhci-q35-7.1.conf.cmd
index 9b45ae9b..87d0f4b7 100644
--- a/test/cfg2cmd/qemu-xhci-q35-7.1.conf.cmd
+++ b/test/cfg2cmd/qemu-xhci-q35-7.1.conf.cmd
@@ -25,5 +25,5 @@
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:aabbccddeeff' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
- -device 'virtio-net-pci,mac=A2:C0:43:77:08:A1,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=1024,bootindex=300' \
+ -device 'virtio-net-pci,mac=A2:C0:43:77:08:A1,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=300' \
-machine 'type=pc-q35-7.1+pve0'
diff --git a/test/cfg2cmd/seabios_serial.conf.cmd b/test/cfg2cmd/seabios_serial.conf.cmd
index 0c3e3ed4..1c4e102c 100644
--- a/test/cfg2cmd/seabios_serial.conf.cmd
+++ b/test/cfg2cmd/seabios_serial.conf.cmd
@@ -29,5 +29,5 @@
-drive 'file=/var/lib/vz/images/8006/vm-8006-disk-0.qcow2,if=none,id=drive-scsi0,discard=on,format=qcow2,cache=none,aio=io_uring,detect-zeroes=unmap' \
-device 'scsi-hd,bus=scsihw0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0,id=scsi0,bootindex=100' \
-netdev 'type=tap,id=net0,ifname=tap8006i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
- -device 'virtio-net-pci,mac=A2:C0:43:77:08:A0,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=1024,bootindex=300' \
+ -device 'virtio-net-pci,mac=A2:C0:43:77:08:A0,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=300' \
-machine 'smm=off,type=pc+pve0'
--
2.39.2
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [pve-devel] [PATCH qemu-server] cfg2cmd: netdev: fix value for tx_queue_size
2023-07-11 10:57 [pve-devel] [PATCH qemu-server] cfg2cmd: netdev: fix value for tx_queue_size Fiona Ebner
@ 2023-07-11 13:52 ` DERUMIER, Alexandre
0 siblings, 0 replies; 2+ messages in thread
From: DERUMIER, Alexandre @ 2023-07-11 13:52 UTC (permalink / raw)
To: pve-devel, f.ebner
Le mardi 11 juillet 2023 à 12:57 +0200, Fiona Ebner a écrit :
>
> @Alexandre: in the commit message of 620d6b32 ("virtio-net: increase
> defaults rx|tx-queue-size to 1024") you talk about DPDK, but isn't
> vhost-user required for that? And I didn't see where we expose
> vhost-user (vhost-net is different AFAICT)?
>
as far I remember, I thinked it was a limitation on guest side virtio-
nic driver. (as qemu was accepting up to 1024).
Should be fine to downgrade it to 256 without breaking live migration.
(for dpdk indeed it need vhost-uset, not currently implemented)
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2023-07-11 13:53 UTC | newest]
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2023-07-11 10:57 [pve-devel] [PATCH qemu-server] cfg2cmd: netdev: fix value for tx_queue_size Fiona Ebner
2023-07-11 13:52 ` DERUMIER, Alexandre
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