| Summary: | Kernel 2.6.40.8-4.fc15.x86_64 performance grossly subpar | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Paul Lambert <eb30750> |
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> |
| Status: | CLOSED CANTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | urgent | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 15 | CC: | gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-11-03 17:35:40 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
|
Description
Paul Lambert
2011-11-03 14:30:49 UTC
Is this with vmware, as in bug 730581 ? It does not matter what VM engine I am using, the point is kernel 8-2 was much improved over 7-3 and 8-4. Kernel 8-2 was working about the same as the kernels in FE13 and FE14. VMware works quite well with kernel 8-2 but none of the other FE15 kernels. There is nothing between 8-2 and 8-4 that could explain this. Removal of a printk, and dropping of a patch that only affected booting certain machines. I suggest bringing it up with vmware, as there's nothing we've changed that can explain your problem. There was no graceful way for me to return to the 8-2 kernel as it is a pre-release of Verne. Therefore, I ran preupgrade and installed the pre-release of Verne in its entirety. Preupgrade has improved considerably and all of the needed software was installed before a reboot is necessary. Upon reboot I was running the 8-2 kernel which is where I wanted to be. Upon running yum update on the update-testing repo the response was no packages marked for update which leads to wonder just where the 8-4 kernel coming from. With the 8-2 kernel the VM engine performs better but still not as smooth as previous kernels. For example it is much more user responsive to dragging the mouse and refreshing windows of the virtual machine but when dragging a scrollbar, it will scroll only in short bursts before freezing momentarily and then continuing. It is my observation that when I have the VM engine in the foreground the kernel is not giving the VM engine the cpu time that it should since when doing so the Fedora user screen is in the background. I use workspace #1 for the Fedora user interface and workspace #2 for the VMware Windows XP user interface. The system is considerably more responsive than with the 8-4 configuration. VMware has not released a new verson of VM Player for well over a year. They have released some minor updates the last in the spring where it was necessary for them to delete some references to outdated kernel functions. This was minor as these calls were already deprecated and the existing VMware release would compile and work just fine by removing the offending entries. As I stated VMware did provide a minor update shortly after the Linux 3-39 kernel release and all was well. This new kernel, 3.1.2-1.fc16.x86_64, has improved VM performance greatly. This is by far the best kernel of the FE16 strain. Now when I have both a Linux desktop open and a VMware Windows open my dual cpus run at around 35%. When I perform some activity on the VM both cpus will top out around 90%. The VM desktop flows smoothly and the mouse/window clicks show no delay. With the previous FE16 kernels the same activities would only drive the dual cpus up to 50%. There was some type of bottleneck limiting the cpu cycles from getting to the VM. |