#17219 closed defect (fixed)
VirtualBox 5.2.0: Interrupt storm on emulated HDA controller (FreeBSD) -> fixed in 5.2.10
| Reported by: | wonko1953 | Owned by: | pentagonik |
|---|---|---|---|
| Component: | audio | Version: | VirtualBox 5.2.0 |
| Keywords: | Cc: | ||
| Guest type: | BSD | Host type: | other |
Description
Scenario:
- VirtualBox 5.2.0 compiled from ports on FreeBSD https://svnweb.freebsd.org/ports/head/emulators/virtualbox-ose/
- patch
svn diff -r69153:69154 http://www.virtualbox.org/svn/vbox(iSCSI fix) applied manually - Both host and client system are FreeBSD 11.1
Result:
- The client boots o.k.
- The client kernel reports an excessive interrupt rate for the HDA audio controller (1k..50k/sec depending on client load) even with no audio playing
- Console output:
interrupt storm detected on "irq21:"; throttling interrupt source interrupt storm detected on "irq21:"; throttling interrupt source interrupt storm detected on "irq21:"; throttling interrupt source
- Running
systat -vm 1:users Load 0.24 0.20 0.09 Oct 27 16:12 Mem usage: 7%Phy 4%Kmem Mem: KB REAL VIRTUAL VN PAGER SWAP PAGER Tot Share Tot Share Free in out in out Act 162036 14172 1293824 16504 2855288 count All 162644 14664 1303256 25644 pages Proc: Interrupts r p d s w Csw Trp Sys Int Sof Flt ioflt 3318 total 96 404 13 544 2973 30 cow atkbd0 1 zfod ata0 14 0.2%Sys 2.6%Intr 0.0%User 0.0%Nice 97.2%Idle ozfod 2 ata1 15 | | | | | | | | | | %ozfod 17 le0 19 + daefr vboxguest0 1 dtbuf prcfr 2953 hdac0 21 Namei Name-cache Dir-cache 42858 desvn totfr 228 cpu0:timer Calls hits % hits % 3572 numvn react 114 cpu3:timer 3 3 100 1740 frevn pdwak 1 cpu2:timer 40 pdpgs 3 cpu1:timer Disks md0 ada0 cd0 pass0 pass1 intrn KB/t 0.00 0.00 0.00 0.00 0.01 64464 wire tps 0 0 0 0 1 96496 act MB/s 0.00 0.00 0.00 0.00 0.00 64636 inact %busy 0 0 0 0 0 laund 2855288 free
Expected result:
- No HDA interrupts as long as no audio is playing
Attachments (3)
Change History (16)
by , 7 years ago
| Attachment: | VBox.log-5.2.0 added |
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by , 7 years ago
| Attachment: | VBox.log-5.1.30 added |
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VBox.Log when running the same machine using VirtualBox 5.1.30
comment:1 by , 7 years ago
I've just uploaded a new 5.2 test build which contains more audio fixes. Could you please give these builds a try and report back if these fix the issue for you? You can get the latest 5.2 test builds here: https://www.virtualbox.org/wiki/Testbuilds
comment:2 by , 7 years ago
| Owner: | set to |
|---|---|
| Status: | new → assigned |
comment:3 by , 7 years ago
I just re-tried this using the latest FreeBSD port, virtualbox-ose-5.2.6_2. The behavior is still the same, there are thousands of interrupts per second on hdac0.
Sorry, I might have missed your previous response. Does this test with virtualbox-ose-5.2.6_2 already include the changes in the test build you wanted me to try 8 weeks ago?
follow-up: 5 comment:4 by , 7 years ago
Diffing a VBox.log from 5.1.30 and from that 5.2.6, there are three additional lines involving HDA:
HDA: Asynchronous I/O enabled
HDA: Codec reset
HDA: Codec reset
So maybe the issue is that on FreeBSD, async I/O with HDA does not work?
comment:5 by , 7 years ago
I have the same problem, and it still occurs with 5.2.8. 5.1.34 is working fine.
comment:6 by , 7 years ago
I have now run openSUSE tumbleweed as client under VBox 5.2.8 on a FreeBSD host in order to get some debug audio using skype in the client.
The audio is very choppy.
I have enabled audio debug acc. to https://www.virtualbox.org/wiki/AudioDebug
The resulting .wav files plus the VBox.log file are attached.
There are many messages like "OSS: Warning: Too big output size (13120 > 256), limiting to 256" in the log file.
by , 7 years ago
| Attachment: | VBox.log.xz added |
|---|
VBox.log running openSUSE tumbleweed on 5.2.8, with audio debug enabled
comment:7 by , 7 years ago
I just noticed that I cannot upload the corresponding .wav files because of a file size limit of 512k. There are the following files:
% ll *.wav -rw-r--r-- 1 test wheel 2892280 Mar 18 11:02 CaptureNonInterleaved-0.wav -rw-r--r-- 1 test wheel 3261088 Mar 18 11:02 DebugAudioOut-0.wav -rw-r--r-- 1 test wheel 4541392 Mar 18 11:02 hdaDMAReadSD4-0.wav -rw-r--r-- 1 test wheel 2684576 Mar 18 11:02 hdaDMAWriteSD0-0.wav -rw-r--r-- 1 test wheel 4541392 Mar 18 11:02 hdaStreamReadSD4-0.wav -rw-r--r-- 1 test wheel 2754852 Mar 18 11:02 hdaStreamWriteSD0-0.wav -rw-r--r-- 1 test wheel 4544472 Mar 18 11:02 PlayNonInterleaved-0.wav -rw-r--r-- 1 test wheel 4544472 Mar 18 11:02 PlayNonInterleaved-2.wav -rw-r--r-- 1 test wheel 2755028 Mar 18 11:02 StreamRead-0.wav -rw-r--r-- 1 test wheel 4544472 Mar 18 11:02 StreamWrite-0.wav -rw-r--r-- 1 test wheel 4544472 Mar 18 11:02 StreamWrite-1.wav -rw-r--r-- 1 test wheel 4544472 Mar 18 11:02 StreamWrite-2.wav %
They all contain the same very choppy sound heard in the emulated OS, so it seems it is a case of
Distorted Distorted Device emulation problem
according to https://www.virtualbox.org/wiki/AudioDebug (some of them with a very low volume, they seem to be the microphone input fed back from the speakers).
If there is a possibility to upload these files tell me, I'll keep them for a while.
follow-ups: 9 11 comment:8 by , 7 years ago
How are comments 6 and 7 relevant to this ticket, which is about an interrupt storm in FreeBSD guests?
The FreeBSD problem should be fixed in the latest 5.2 test build, it was a bug in the HDA emulation (incorrectly reporting an interrupt that the guest OS didn't know how to clear). Probably has zero impact on other guest OSes.
For the sake of completeness: The FreeBSD HDA interrupt handler writes the INTSTS register, which is specified as read-only. It's not clear to us what that is meant to accomplish, although the only harm it causes is slowing things down.
follow-up: 12 comment:9 by , 7 years ago
Replying to michaln:
The FreeBSD problem should be fixed in the latest 5.2 test build, it was a bug in the HDA emulation (incorrectly reporting an interrupt that the guest OS didn't know how to clear). Probably has zero impact on other guest OSes.
For the sake of completeness: The FreeBSD HDA interrupt handler writes the INTSTS register, which is specified as read-only. It's not clear to us what that is meant to accomplish, although the only harm it causes is slowing things down.
The original HDA 1.0 Spec. said INTSTS was RW1C instead of RO, it seems. Actually, Google found this:
comment:10 by , 7 years ago
| Resolution: | → fixed |
|---|---|
| Status: | assigned → closed |
| Summary: | VirtualBox 5.2.0: Interrupt storm on emulated HDA controller (FreeBSD) → VirtualBox 5.2.0: Interrupt storm on emulated HDA controller (FreeBSD) -> fixed in 5.2.10 |
comment:11 by , 7 years ago
Replying to michaln:
How are comments 6 and 7 relevant to this ticket, which is about an interrupt storm in FreeBSD guests?
The FreeBSD problem should be fixed in the latest 5.2 test build, it was a bug in the HDA emulation (incorrectly reporting an interrupt that the guest OS didn't know how to clear). Probably has zero impact on other guest OSes.
For the sake of completeness: The FreeBSD HDA interrupt handler writes the INTSTS register, which is specified as read-only. It's not clear to us what that is meant to accomplish, although the only harm it causes is slowing things down.
Actually, it was me who reported the ticket and who added both these two comments. I simply thought the problems might be related.
But thank you for providing a fix to the original issue, I'm just compiling now and will report how well the latest version works. Also thanks to jkim for quickly updating the FreeBSD port.
comment:12 by , 7 years ago
Replying to jkim:
The original HDA 1.0 Spec. said INTSTS was RW1C instead of RO, it seems. Actually, Google found this:
Ah, nice -- you found an official document showing the INTSTS write done by FreeBSD is redundant and explaining why the code was written that way :) I unfortunately don't know if there might be any hardware implementing the originally specified behavior. Actual Intel chips definitely should not need it, they always documented INTST as R/O in datasheets.
comment:13 by , 7 years ago
The interrupt issue is indeed resolved, thanks for the fix.
And the skype audio quality (as described in comments 6 and 7) is still bad, so indeed this is another issue. This is with a Linux client. However, amarok audio output is o.k., so maybe this is a skype issue.
Interestingly, with a Windows 10 preview client the audio is good.
Interestingly, also with a FreeBSD client the audio is good (only output tested).
VBox.Log when using VirtualBox 5.2.0