| Summary: | Regression in i915 leads to extremely sluggish desktop behaviour | ||||||
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| Product: | [Fedora] Fedora | Reporter: | Lars Seipel <ls> | ||||
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> | ||||
| Status: | CLOSED RAWHIDE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||
| Severity: | high | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | rawhide | CC: | brianmury, gansalmon, guattari, itamar, jistone, jonathan, kernel-maint, madhu.chinakonda, mangobrain, ntl, timosha | ||||
| 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: | 2011-07-11 20:29:13 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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Re-enabling the use of semaphores by booting with i915.semaphores=1 fixes the problem for me. It seems that it is caused by upstream commit 087fbc9962e10a65fb0b542ecfc116ebf6cf1735 which ought to fix things for other people. Seeing this issue with a Core i7 Sandy Bridge system (F15 userspace) as well. kernel-2.6.39-0.rc6.git0.0.fc16.x86_64: good kernel-2.6.39-1.fc16.x86_64: bad The current version of the kernel for F15 also shows this behavior with a Sandy Bridge Core i5-2500K. 2.6.38.7-30.fc15.x86_64 kernel-3.0-0.rc2.git0.2.fc16.x86_64: bad (In reply to comment #3) > The current version of the kernel for F15 also shows this behavior with a Sandy > Bridge Core i5-2500K. > > 2.6.38.7-30.fc15.x86_64 I have this issue on the same kernel with i7-2600. So far, i915.semaphores=1 has been behaving well. Possible fix here: https://lkml.org/lkml/2011/6/14/270 Seems to address the issue for me when applied to v3.0-rc3. Appears to be fixed with 3.0-0.rc4.git0.2.fc16.x86_64, presumably by commit 498e720b96379d8ee9c294950a01534a73defcf3 "drm/i915: Fix gen6 (SNB) missed BLT ring interrupts." Yup. Seems to be fixed. Gnome3 became so fast and no more annoying errors in dmesg. kernel-3.0-0.rc5.git0.1.fc15.x86_64 |
Created attachment 499965 [details] dmesg output Description of problem: I'm using Fedora on a Thinkpad X220 based on Intel's Sandy Bridge processor and GPU. It runs a kernel from Rawhide on top of the F15 userspace. While I had minor issues with F15's 2.6.38 kernel the system ran absolutely flawless with 2.6.39-0.rc7.git0.0 (checked out from git with fedpkg). Then I built and installed 2.6.39-0.rc7.git6.0 and after reboot the system felt very sluggish. Hitting the "hot corner" in gnome-shell sometimes doesn't even produce a reaction. When this happens, dmesg gets filled with messages like these: [ 40.694093] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 2458, at 2458], missed IRQ? [ 45.012293] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 2813, at 2813], missed IRQ? [ 441.453869] [drm:i915_hangcheck_ring_idle] *ERROR* Hangcheck timer elapsed... blt ring idle [waiting on 36206, at 36206], missed IRQ? There seems to be one of those entries for every time I try hitting the hot corner. 2.6.39-0.rc7.git6.1 (from rawhide repo) and the final 2.6.39 don't change this behaviour in any way. The 2.6.38 kernel from F15 exhibits the problem in a much less severe way, i.e. it doesn't occur right after reboot but more likely after waking up from suspend and is not really reproducible. 2.6.39-0.rc7.git0.0 doesn't show the issue at all in days of constant use. Just tell me if you need any additional information. Version-Release number of selected component (if applicable): kernel-2.6.39-0.rc7.git0.0.mfq.fc16.x86_64 (selfbuilt) fine kernel-2.6.39-0.rc7.git6.1.fc16.x86_64 (from Fedora repos) broken kernel-2.6.39-0.mfq.fc16.x86_64 (selfbuilt) broken How reproducible: 100% with 2.6.39 kernels after 0.rc7.git6.0 Steps to Reproduce: 1. boot Rawhide kernel on Thinkpad X220 (Core i5, SandyBridge) and login to Gnome 2. use the Desktop (the hot corner seems pretty reliable for provoking this) 3. get some really sluggish user experience and watch dmesg fill up Actual results: User experience is sluggish. System log gets filled with the messages above Expected results: User experience is fine like with kernel-2.6.39-0.rc7.git0.0. System logs stays clean. Additional info: