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Bug 1645853
| Summary: | PXE boot on armhfp slow due to Kernel wait for crng random data | ||||||||||
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| Product: | [Fedora] Fedora | Reporter: | Adam Farden <adam.farden> | ||||||||
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> | ||||||||
| Status: | CLOSED INSUFFICIENT_DATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||||
| Severity: | unspecified | Docs Contact: | |||||||||
| Priority: | unspecified | ||||||||||
| Version: | 29 | CC: | adam.farden, airlied, bskeggs, ewk, hdegoede, ichavero, itamar, jarodwilson, jglisse, john.j5live, jonathan, josef, kernel-maint, labbott, linville, mchehab, mjg59, steved | ||||||||
| Target Milestone: | --- | Flags: | adam.farden:
needinfo-
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| Target Release: | --- | ||||||||||
| Hardware: | Unspecified | ||||||||||
| OS: | Unspecified | ||||||||||
| Whiteboard: | |||||||||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||||||
| Doc Text: | Story Points: | --- | |||||||||
| Clone Of: | Environment: | ||||||||||
| Last Closed: | 2019-04-09 20:07:06 UTC | Type: | Bug | ||||||||
| 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: | 245418 | ||||||||||
| Attachments: |
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Description
Adam Farden
2018-11-04 11:47:25 UTC
I should not that this is only for PXE boot, boot works as expected when using an SD Card. The same behaviour is seen with Raspberry Pi 3, so it's not limited to this board. I noticed that when eventually booted the amount of entropy available increases very slowly, on the order of 1 bit every few seconds (as seen by polling /proc/sys/kernel/random/entropy_avail). I have no idea yet if this is normal or not, but I suspect it is not. So I'm currently investigating why a PXE boot cannot provide entropy for /dev/random but an SD Card boot can. The only difference I've seen so far by comparing logs from UART are a few modprobe failures when booting from PXE. However this is far outside my area of expertise, any insights would be welcome. Google searching the issue has pointed me to a service called haveged, which I will try adding to the initial initrd.img. Created attachment 1502353 [details]
haveged dracut service
Created attachment 1502354 [details]
haveged dracut service
So I was able to boot in under a minute when I added the haveged dracut service to the pxeboot initrd (see attached). If a fix is required, should it be in the kernel, or should it be in the dracut image? As it is right now, the current pxeboot image is likely useless for most, if not all, armhfp boards. I failed to mention this but the original initrd.img and vmlinuz came from https://download.fedoraproject.org/pub/fedora/linux/releases/29/Server/armhfp/os/images/pxeboot/ which is Linux version 4.18.16-300.fc29.armv7hl We apologize for the inconvenience. There is a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 29 kernel bugs. Fedora 29 has now been rebased to 4.19.5-300.fc29. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you experience different issues, please open a new bug report for those. Since this bug hasn't been updated since the last needinfo I'm going to close this bug. Please test on the newest kernel and reopen if the problem persists. |