| Summary: | Failed enable VFs of 82576NIC on 32bits host | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Yuyu Zhou <yuzhou> | ||||
| Component: | kernel-xen | Assignee: | Xen Maintainance List <xen-maint> | ||||
| Status: | CLOSED NOTABUG | QA Contact: | Virtualization Bugs <virt-bugs> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 5.7 | CC: | drjones, leiwang, qwan, xen-maint | ||||
| Target Milestone: | rc | Keywords: | Regression | ||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2011-04-19 08:17:31 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Attachments: |
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Created attachment 493061 [details]
dmesg log
At first glance I don't see any suspicious commits in the kernel between -256 and -257, and nothing changed in the hypervisor. Can we get the dmesg from the working 32-bit -256 kernel? Actually, it might be easier if we just get access to the machine. Diffing the dmesgs revealed a typo on the -257 command line
< Kernel command line: ro root=LABEL=/ pci_pt_e820_access=on
< pci_pt_e820_access: enabled
---
> Kernel command line: ro root=LABEL=/ pci_pt_e820=access=on
note the extra = that should be a '_' in pci_pt_e820=access=on
Correcting the typo in grub and rebooting restores the functionality.
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Description of problem: Failed to enable VFs of Intel 82576 NIC on 32bits host. Version-Release number of selected component (if applicable): kernel-xen-2.6.18-257.el5.i686 xen-3.0.3-128.el5 How reproducible: 100% Steps to Reproduce: 1- boot up xen host with iommu and pci_pt_e820_access enabled Add "iommu=1" in kernel line Add "pci_pt_e820_access=on" in module line Example: title Red Hat Enterprise Linux Server (2.6.18-164.9.1.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-164.9.1.el5 iommu=1 loglvl=all guest_loglvl=all module /vmlinuz-2.6.18-164.9.1.el5xen ro root=/dev/VolGroup01/LogVol00 pci_pt_e820_access=on module /initrd-2.6.18-164.9.1.el5xen.img 2- Check whether PF enabled in Dom0 Example: # lspci | grep 82576 Two PF NIC should be shown 3- Reload igb (driver for intel 82576 NIC) module with max_vfs=7 parameter # modprobe -r igb # modprobe igb max_vfs=7 4- - Check whether N VFs enabled in Dom0 # lspci | grep 82576 Corresponding number of VFs should be shown. Actual results: On Step 4, only 2 PFs should be shown Expected results: On Step 4, 14 VFs and 2 PFs should be shown Addition info: It works fine with kernel-xen-2.6.18-257.el5.x86_64 for 64bits host. It also works fine for for kernel-xen-2.6.18-256.el5 on both 32bit and 64bit host. Furthermore, it also works fine with bare metal kernel (kernel-2.6.18-257.el5.i686).