Bug 503191
| Summary: | [RHEL5.4 Xen]: Tun patch causing connectathon to fail | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Chris Lalancette <clalance> |
| Component: | kernel-xen | Assignee: | Herbert Xu <herbert.xu> |
| Status: | CLOSED ERRATA | QA Contact: | Red Hat Kernel QE team <kernel-qe> |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 5.4 | CC: | dzickus, herbert.xu, markmc, peterm, sghosh, syeghiay, xen-maint |
| Target Milestone: | rc | Keywords: | Regression |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2009-09-02 08:57:52 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: | |||
|
Description
Chris Lalancette
2009-05-29 14:36:42 UTC
Created attachment 346345 [details]
epoll keyed wakeups: add __wake_up_locked_key() and __wake_up_sync_key()
Created attachment 346346 [details]
epoll keyed wakeups: introduce new *_poll() wakeup macros
Created attachment 346347 [details]
tun: Only wake up writers
Created attachment 346384 [details]
tun: Only wake up writers
tun: Only wake up writers
When I added socket accounting to tun I inadvertently introduced
spurious wake-up events that kills qemu performance. The problem
occurs when qemu polls on the tun fd for read, and then transmits
packets. For each packet transmitted, we will wake up qemu even
if it only cares about read events.
Now this affects all sockets, but it is only a new problem for
tun. So this patch tries to fix it for tun first and we can then
look at the problem in general.
Signed-off-by: Herbert Xu <herbert.org.au>
It also breaks kvm networking. Going back to kernel -149 fixed the problem. Grrr, wrong typing. I am using RHEL 5.4 beta. (-150 kernel). Went back to -146 as clalance suggestion, and now I have bridging working back with kvm. I installed -147, and that one already get broked networking. in kernel-2.6.18-153.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5 Please do NOT transition this bugzilla state to VERIFIED until our QE team has sent specific instructions indicating when to do so. However feel free to provide a comment indicating that this fix has been verified. An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2009-1243.html |