Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 648603 (LibvirtNetworkParms)

Summary:	Expose QEMU network controls
Product:	Red Hat Enterprise Linux 6	Reporter:	Glauber Costa <gcosta>
Component:	libvirt	Assignee:	Michal Privoznik <mprivozn>
Status:	CLOSED WONTFIX	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	low
Version:	6.0	CC:	dallan, eblake, laine, mst, xen-maint
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-11-23 15:16:10 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:
Bug Blocks:	644849

Description Glauber Costa 2010-11-01 17:50:02 UTC

QEMU networking has some knobs that would be interesting to be in control of.

Those include tx mitigation on/off, number of vhost threads, etc.
Would be good to have a supported libvirt way to pass them to qemu.

Comment 2 Dave Allan 2011-01-05 19:49:44 UTC

Some related work that is settling the upstream debate is being done upstream this week.  These knobs would slot into that work nicely.

Comment 5 Laine Stump 2011-01-25 19:25:10 UTC

(The upstream work for adding the sndbuf tunable (which is generic to all tap-based network devices) is detailed in Bug 665293. The work for adding a selection of vhost vs. userland backend (which is specific to virtio) is in Bug 643050.)

Where are these other knobs documented? I see nothing in the qemu -help output (of 0.13.0, at least).

Comment 6 Michal Privoznik 2011-02-03 14:20:46 UTC

so, are there any other network controls you want to have exposed? Can you please enumerate them?

and as laine pointed out - could you please link docs where are these knobs documented? i've tried 0.14.0-rc0 and the changes are also only minor.