Bug 1375597
| Summary: | Increase the queue size to the max allowed, 1024. | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Marcel Kolaja <mkolaja> |
| Component: | libvirt | Assignee: | Michal Privoznik <mprivozn> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | urgent | Docs Contact: | |
| Priority: | urgent | ||
| Version: | 7.2 | CC: | ailan, areis, atheurer, chayang, dyuan, fbaudin, fleitner, fpan, ganguly, iawells, jasowang, jdonohue, jherrman, jsuchane, juzhang, knoel, krister, lhuang, lmiksik, markmc, maxime.coquelin, mprivozn, mrezanin, mst, pezhang, rbalakri, tlavigne, virt-maint, yalzhang, zshi |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | libvirt-1.2.17-13.el7_2.6 | Doc Type: | Enhancement |
| Doc Text: |
It is now possible to specify the virtio data buffer limit between a guest and the QEMU emulator. To do this, change the value of the <driver rx_queue_size='N'/> parameter in the guest's domain XML file, where N can be from 256 to 1024.
|
Story Points: | --- |
| Clone Of: | 1366989 | Environment: | |
| Last Closed: | 2016-11-09 17:17:07 UTC | Type: | --- |
| 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: | 1366989 | ||
| Bug Blocks: | |||
|
Description
Marcel Kolaja
2016-09-13 14:00:06 UTC
Moving to POST: http://post-office.corp.redhat.com/archives/rhvirt-patches/2016-September/msg00323.html Scratch build: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=11743870 Another try: http://post-office.corp.redhat.com/archives/rhvirt-patches/2016-October/msg00031.html Scratch build: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=11855151
# rpm -q libvirt qemu-kvm-rhev spice-server
libvirt-1.2.17-13.el7_2.6.x86_64
qemu-kvm-rhev-2.3.0-31.el7_2.22.x86_64
spice-server-0.12.4-15.el7_2.2.x86_64
# uname -a
Linux localhost.localdomain 3.10.0-327.42.1.el7.x86_64 #1 SMP Wed Oct 5 07:15:46 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux
1. negative test, define the rx_queue_size to some negative ones, PASS.
2. migration test, migrate during the guest is copying a big file with rx_queue_size defined(libvirt-1.2.17-13.el7_2.6.x86_64<->libvirt-1.2.17-13.el7_2.6.x86_64), then migrate back, PASS;
3. hotplug,PASS
1. negative test
1)try -2, sdf
# virsh edit rhel7.2
error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content
Failed. Try again? [y,n,i,f,?]:
2) try 111
# virsh edit rhel7.2
Domain rhel7.2 XML configuration edited.
# virsh start rhel7.2
error: Failed to start domain rhel7.2
error: unsupported configuration: rx_queue_size has to be a power of two
3) try 128, 2048,
# virsh edit rhel7.2
Domain rhel7.2 XML configuration not changed.
# virsh start rhel7.2
error: Failed to start domain rhel7.2
error: internal error: process exited while connecting to monitor: 2016-10-09T03:51:22.727663Z qemu-kvm: -device virtio-net-pci,rx_queue_size=128,netdev=hostnet0,id=net0,mac=52:54:00:68:bb:04,bus=pci.0,addr=0x3: Invalid rx_queue_size (= 128), must be a power of 2 between 256 and 1024.
2016-10-09T03:51:22.727849Z qemu-kvm: -device virtio-net-pci,rx_queue_size=128,netdev=hostnet0,id=net0,mac=52:54:00:68:bb:04,bus=pci.0,addr=0x3: Device 'virtio-net-pci' could not be initialized
4) try 256, 512, 1024,
the guest can start, check the qemu command line and check on guest by "ethtool -g", all the results is as expected.
2. migration test, migrate during copy a file into the guest.
1) migrate libvirt-1.2.17-13.el7_2.6.x86_64<->libvirt-1.2.17-13.el7_2.6.x86_64, set the rx_queue_size as 1024/512/256.
on another host, copy file to the guest. During copy file, do the migration. After migration, check the file's checksum keep unchanged.
# scp /home/yalzhang/Downloads/iso/win7.iso 10.66.4.218:/home
# virsh migrate s1 --live qemu+ssh://server/system --verbose
root@server's password:
Migration: [100%]
Then migrate back.
2) migrate libvirt-1.2.17-13.el7_2.6.x86_64<->libvirt-2.0.0-10.el7.x86_64 (rhel7.3), PASS.
3. # cat inter
<interface type='network'>
<source network='default'/>
<model type='virtio'/>
<driver name='vhost' queues='5' rx_queue_size='1024'/>
</interface>
# virsh attach-device rhel7.2 inter --config --live
Device attached successfully
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-2688.html |