Bug 624769
| Summary: | Blacklist vhost_net | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Alex Williamson <alex.williamson> | ||||||||
| Component: | qemu-kvm | Assignee: | Alex Williamson <alex.williamson> | ||||||||
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Virtualization Bugs <virt-bugs> | ||||||||
| Severity: | urgent | Docs Contact: | |||||||||
| Priority: | low | ||||||||||
| Version: | 6.0 | CC: | acathrow, amit.shah, chrisw, Jes.Sorensen, mjenner, mkenneth, moli, mwagner, syeghiay, tburke, virt-maint, wquan | ||||||||
| Target Milestone: | rc | ||||||||||
| Target Release: | --- | ||||||||||
| Hardware: | All | ||||||||||
| OS: | Linux | ||||||||||
| Whiteboard: | |||||||||||
| Fixed In Version: | qemu-kvm-0.12.1.2-2.111.el6 | Doc Type: | Bug Fix | ||||||||
| Doc Text: | Story Points: | --- | |||||||||
| Clone Of: | Environment: | ||||||||||
| Last Closed: | 2010-11-10 21:27:38 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: | |||||||||||
| Attachments: |
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Description
Alex Williamson
2010-08-17 17:20:57 UTC
brew build, including bz624767 fix: https://brewweb.devel.redhat.com/taskinfo?taskID=2686099 *** Bug 624746 has been marked as a duplicate of this bug. *** I see the patch is to blacklist vhost-net but is that the right fix? vhost-net isn't loaded automatically it's explicitly loaded by /etc/sysconfig/modules/kvm.modules So I think the fix should be to remove that line from kvm.modules - see BZ596891 (In reply to comment #3) > I see the patch is to blacklist vhost-net but is that the right fix? > > vhost-net isn't loaded automatically it's explicitly loaded by > /etc/sysconfig/modules/kvm.modules > > So I think the fix should be to remove that line from kvm.modules - see > BZ596891 If we only remove the line in kvm.modules, what stops a user, or even gives them any indication, that they shouldn't use vhost_net? Adding a /etc/modprobe.d/blacklist-kvm.conf stops both kvm.modules from loading it, and helps the user know they shouldn't try it. brew with only the blacklist change: https://brewweb.devel.redhat.com/taskinfo?taskID=2686282 Created attachment 439688 [details]
result for 109 (vhost) against 111 virtio-net
Seems we have a performance drop with small packets after blacklisting.
(In reply to comment #10) > > Seems we have a performance drop with small packets after blacklisting. This is expected. Created attachment 441098 [details]
virtio-net-Rhel6-vs-Rhel5.5
result for rhel 6 vs rhel 5.5 GA in virtio-userspace .
Quan, would it be possible to do one more comparison using this brew build? https://brewweb.devel.redhat.com/taskinfo?taskID=2709720 Created attachment 441431 [details]
result for rhel6 qemu 113 vs rhel6 qemu 111 vs rhel 5.5 GA in virtio-userspace .
confirmed this bug with Alex Williamson , We mark this verified. Thanks~~ Red Hat Enterprise Linux 6.0 is now available and should resolve the problem described in this bug report. This report is therefore being closed with a resolution of CURRENTRELEASE. You may reopen this bug report if the solution does not work for you. |