Bug 962733
| Summary: | Without vhost=on, during netperf w/ protocol UDP_STREAM in guest, this guest can not response other thing | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Qian Guo <qiguo> | ||||
| Component: | qemu-kvm | Assignee: | Michael S. Tsirkin <mst> | ||||
| Status: | CLOSED WONTFIX | QA Contact: | xiywang | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 7.0 | CC: | ailan, chayang, hhuang, jasowang, juzhang, knoel, michen, mst, rbalakri, virt-maint, xiywang | ||||
| Target Milestone: | rc | ||||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | |||||||
| : | 1272311 1272312 (view as bug list) | Environment: | |||||
| Last Closed: | 2018-02-07 23:02:08 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 962749, 1272311, 1272312 | ||||||
| Attachments: |
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check the guest network # ethtool -k eth0 Features for eth0: rx-checksumming: off [fixed] tx-checksumming: on tx-checksum-ipv4: off [fixed] tx-checksum-ip-generic: on tx-checksum-ipv6: off [fixed] tx-checksum-fcoe-crc: off [fixed] tx-checksum-sctp: off [fixed] scatter-gather: on tx-scatter-gather: on tx-scatter-gather-fraglist: on tcp-segmentation-offload: on tx-tcp-segmentation: on tx-tcp-ecn-segmentation: on tx-tcp6-segmentation: on udp-fragmentation-offload: on generic-segmentation-offload: on generic-receive-offload: on large-receive-offload: off [fixed] rx-vlan-offload: off [fixed] tx-vlan-offload: off [fixed] ntuple-filters: off [fixed] receive-hashing: off [fixed] highdma: on [fixed] rx-vlan-filter: on [fixed] vlan-challenged: off [fixed] tx-lockless: off [fixed] netns-local: off [fixed] tx-gso-robust: off [fixed] tx-fcoe-segmentation: off [fixed] tx-gre-segmentation: off [fixed] fcoe-mtu: off [fixed] tx-nocache-copy: on loopback: off [fixed] rx-fcs: off [fixed] rx-all: off [fixed] Test this with # uname -r 3.10.0-33.el7.x86_64 # rpm -q qemu-kvm qemu-kvm-1.5.3-7.el7.x86_64 1.If enable zerocopytx, won't hit this issue, if disable zerocopytx, even set vhost=on, will hit this. 2.If set sndbuf=1048576, this issue disappears. (In reply to Qian Guo from comment #3) > Test this with > # uname -r > 3.10.0-33.el7.x86_64 > # rpm -q qemu-kvm > qemu-kvm-1.5.3-7.el7.x86_64 > > 1.If enable zerocopytx, won't hit this issue, if disable zerocopytx, even > set vhost=on, will hit this. This is because vhost limit the max pending buffers. > > 2.If set sndbuf=1048576, this issue disappears. Let's try to see if there's a workaround. Does using sfq in host or guest help to solve this issue? Thanks The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days |
Created attachment 747629 [details] guest log from booting to finished the UDP_STREAM test w/o vhost=on Description of problem: Boot a rhel7 guest w/ a virtio-net-pci device, but w/o vhost=on, when test netperf and protocol UDP_STREAM inside guest, during the stress, guest can not response any other things, such as click mouse, input keys ... If boot w/ vhost=on, won't hit this problem. Version-Release number of selected component (if applicable): # uname -r 3.9.0-0.55.el7.x86_64 # rpm -q qemu-kvm qemu-kvm-1.4.0-4.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.Boot a rhel7 guest w/ virtio-net-pci device but do not add option vhost=on. /usr/libexec/qemu-kvm -M pc -enable-kvm -m 4096 -smp 4,sockets=1,cores=4,threads=1 -name rhel7 -drive file=/home/rhel7cp1.qcow3,if=none,id=drive-ide1-1-0,format=qcow2,cache=none,werror=stop,rerror=stop,aio=threads -device ide-drive,bus=ide.1,drive=drive-ide1-1-0,id=ide1-1-0 -vnc :10 -vga qxl -monitor stdio -nodefaults -nodefconfig -device virtio-balloon-pci,id=balloon1 -netdev tap,id=netdev1,script=/etc/qemu-ifup -device virtio-net-pci,netdev=netdev1,id=vnic1,mac=54:52:1a:23:0b:01 2.In any host run a netserver, and in this guest test nerperf w/ protocol UDP_STREAM # netperf -H 10.66.106.3 -t UDP_STREAM -l 30 3.On the vnc window, try to type or click or send ctrl-alt-f2 Actual results: From the vnc window(w/ GUI), can not do anything, seams lose response. Expected results: guest works well Additional info: 1.When resume from the stress, cat the log, that from doing stress. ... May 14 06:41:08 unused kernel: [ 117.164075] psmouse serio1: Explorer Mouse at isa0060/serio1/input0 lost synchronization, throwing 1 bytes away. May 14 06:41:08 unused kernel: [ 117.195621] psmouse serio1: resync failed, issuing reconnect request May 14 06:41:55 unused gnome-keyring-daemon[1494]: Gkm: unsupported key algorithm in certificate: 1.2.840.10045.2.1 May 14 06:41:55 unused gnome-keyring-daemon[1494]: Gkm: unsupported key algorithm in certificate: 1.2.840.10045.2.1 May 14 06:41:55 unused gnome-keyring-daemon[1494]: Gkm: unsupported key algorithm in certificate: 1.2.840.10045.2.1 May 14 06:41:55 unused gnome-keyring-daemon[1494]: Gkm: unsupported key algorithm in certificate: 1.2.840.10045.2.1 May 14 06:41:55 unused gnome-keyring-daemon[1494]: Gkm: unsupported key algorithm in certificate: 1.2.840.10045.2.1 ... will attach the whole log. 2. Test w/ vhost=on, not hit this problem, and test e1000, not hit this problem. 3. If you want to reproduce this, please set the time longer.