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Bug 1824126 - [virtual-network][mq][Windows vm][RHEL.8.2 slow train]qemu output error info: qemu-kvm: unable to start vhost net: 14: falling back on userspace virtio
Summary: [virtual-network][mq][Windows vm][RHEL.8.2 slow train]qemu output error info:...
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: qemu-kvm
Version: 8.2
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: 8.0
Assignee: ybendito
QA Contact: Lei Yang
URL:
Whiteboard:
Depends On: 1608226 1702608
Blocks: 1649160
TreeView+ depends on / blocked
 
Reported: 2020-04-15 11:13 UTC by Peixiu Hou
Modified: 2022-06-20 08:16 UTC (History)
22 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1702608
Environment:
Last Closed: 2021-07-01 08:01:38 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Comment 7 Lei Yang 2021-01-12 07:16:12 UTC 
Hi Yuri

I reproduced this bug on RHEL8.2 slow train.
Test Version:
qemu-kvm-2.12.0-99.module+el8.2.0+5827+8c39933c.x86_64
kernel-4.18.0-193.el8.x86_64

How reproducible:
100%

==steps
1.queues number smaller than CPUs number, qemu without output.
-smp 8  \
-device virtio-net-pci,mac=9a:89:b9:bc:88:b2,id=idyhQr7l,netdev=idNVyWKH,mq=on,vectors=10,bus=pcie-root-port-3,addr=0x0  \
-netdev tap,id=idNVyWKH,vhost=on,queues=4 \

2.queues number equal to CPUs number, qemu output error info.
-smp 8  \
-device virtio-net-pci,mac=9a:89:b9:bc:88:b2,id=idyhQr7l,netdev=idNVyWKH,mq=on,vectors=18,bus=pcie-root-port-3,addr=0x0  \
-netdev tap,id=idNVyWKH,vhost=on,queues=8 \

(qemu) qemu-kvm: unable to start vhost net: 14: falling back on userspace virtio
qemu-kvm: unable to start vhost net: 14: falling back on userspace virtio

3.queues number large than CPUs number, qemu output error info.
-smp 8  \
-device virtio-net-pci,mac=9a:89:b9:bc:88:b2,id=idyhQr7l,netdev=idNVyWKH,mq=on,vectors=26,bus=pcie-root-port-3,addr=0x0  \
-netdev tap,id=idNVyWKH,vhost=on,queues=12 \

(qemu) qemu-kvm: unable to start vhost net: 14: falling back on userspace virtio
qemu-kvm: unable to start vhost net: 14: falling back on userspace virtio

Tested on RHEL.8.4 slow train, and now there is no problem. According to comment 5, the problem has not reproduced in RHEL.8.3 slow train. Can you help to check it? Has this problem been resolved on slow trains? If it is fixed, we should change the status of this bug.

Test Version on RHEL.8.4 slow train:
kernel-4.18.0-270.el8.x86_64
qemu-kvm-4.2.0-40.module+el8.4.0+9278+dd53883d.x86_64

Best Regards
Lei Yang
Comment 13 Lei Yang 2021-04-01 08:02:15 UTC 
Hi Martin

According to Comments 11,12. Is this problem worth fixing on RHEL8.2.z? If it doesn’t need to be fixed on RHEL8.2.z, can I close the bug as "WONTFIX"? Thanks in advance.

Best Regards
Lei
Comment 14 Lei Yang 2021-06-18 02:39:17 UTC 
Hi Martin

Could you please help check the Comment 11,12,13 and comment at your earliest convenience? Thanks in advance!

Best Regards
Lei
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