On Tue, Jan 17, 2023 at 08:58:57AM +0100, Takashi Iwai wrote: > On Mon, 16 Jan 2023 16:55:11 +0100, > Takashi Iwai wrote: > > > > On Tue, 27 Dec 2022 16:26:54 +0100, > > Marek Marczykowski-Górecki wrote: > > > > > > On Thu, Dec 22, 2022 at 09:09:15AM +0100, Takashi Iwai wrote: > > > > On Sat, 10 Dec 2022 17:17:42 +0100, > > > > Marek Marczykowski-Górecki wrote: > > > > > > > > > > On Sat, Dec 10, 2022 at 02:00:06AM +0100, Marek Marczykowski-Górecki wrote: > > > > > > On Fri, Dec 09, 2022 at 01:40:15PM +0100, Marek Marczykowski-Górecki wrote: > > > > > > > On Fri, Dec 09, 2022 at 09:10:19AM +0100, Takashi Iwai wrote: > > > > > > > > On Fri, 09 Dec 2022 02:27:30 +0100, > > > > > > > > Marek Marczykowski-Górecki wrote: > > > > > > > > > > > > > > > > > > Hi, > > > > > > > > > > > > > > > > > > Under Xen PV dom0, with Linux >= 5.17, sound stops working after few > > > > > > > > > hours. pavucontrol still shows meter bars moving, but the speakers > > > > > > > > > remain silent. At least on some occasions I see the following message in > > > > > > > > > dmesg: > > > > > > > > > > > > > > > > > > [ 2142.484553] snd_hda_intel 0000:00:1f.3: Unstable LPIB (18144 >= 6396); disabling LPIB delay counting > > > > > > > > > > > > Hit the issue again, this message did not appear in the log (or at least > > > > > > not yet). > > > > > > > > > > > > (...) > > > > > > > > > > > > > > In anyway, please check the behavior with 6.1-rc8 + the commit > > > > > > > > cc26516374065a34e10c9a8bf3e940e42cd96e2a > > > > > > > > ALSA: memalloc: Allocate more contiguous pages for fallback case > > > > > > > > from for-next of my sound git tree (which will be in 6.2-rc1). > > > > > > > > > > > > This did not helped. > > > > > > > > > > > > > Looking at the mentioned commits, there is one specific aspect of Xen PV > > > > > > > that may be relevant. It configures PAT differently than native Linux. > > > > > > > Theoretically Linux adapts automatically and using proper API (like > > > > > > > set_memory_wc()) should just work, but at least for i915 driver it > > > > > > > causes issues (not fully tracked down yet). Details about that bug > > > > > > > report include some more background: > > > > > > > https://lore.kernel.org/intel-gfx/Y5Hst0bCxQDTN7lK@mail-itl/ > > > > > > > > > > > > > > Anyway, I have tested it on a Xen modified to setup PAT the same way as > > > > > > > native Linux and the audio issue is still there. > > > > > > > > > > > > > > > If the problem persists, another thing to check is the hack below > > > > > > > > works. > > > > > > > > > > > > Trying this one now. > > > > > > > > > > And this one didn't either :/ > > > > > > > > (Sorry for the late reply, as I've been off in the last weeks.) > > > > > > > > I think the hack doesn't influence on the PCM buffer pages, but only > > > > about BDL pages. Could you check the patch below instead? > > > > It'll disable the SG-buffer handling on x86 completely. > > > > > > This seems to "fix" the issue, thanks! > > > I guess I'll run it this way for now, but a proper solution would be > > > nice. Let me know if I can collect any more info that would help with > > > that. > > > > Then we seem to go back again with the coherent memory allocation for > > the fallback sg cases. It was changed because the use of > > dma_alloc_coherent() caused a problem with IOMMU case for retrieving > > the page addresses, but since the commit 9736a325137b, we essentially > > avoid the fallback when IOMMU is used, so it should be fine again. > > > > Let me know if the patch like below works for you instead of the > > previous hack to disable SG-buffer (note: totally untested!) > > Gah, there was an obvious typo, scratch that. > > Below is a proper patch. Please try this one instead. Thanks, I'll give it a try. -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab
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