Re: kern/56059: speaker(4): system hangs if tone < 100 Hz (_SC_CLK_TCK) is played

[Tetsuya Isaki <isaki%pastel-flower.jp@localhost>]

The following reply was made to PR kern/56059; it has been noted by GNATS.

From: Tetsuya Isaki <isaki%pastel-flower.jp@localhost>
To: RVP <rvp%SDF.ORG@localhost>
Cc: gnats-bugs%netbsd.org@localhost,
	kern-bug-people%netbsd.org@localhost,
	gnats-admin%netbsd.org@localhost,
	netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/56059: speaker(4): system hangs if tone < 100 Hz (_SC_CLK_TCK) is played
Date: Sat, 20 Mar 2021 14:54:33 +0900

 At Thu, 18 Mar 2021 08:07:39 +0000 (UTC),
 RVP wrote:
 > Poking around in the sources a bit led me to wonder if generating
 > (small) samples for tones < 100Hz was leading to a buffer underrun
 > somewhere. And, it seems this is so: raising the hw.audio0.blk_ms
 > value "fixes" the kernel hang for me. A value of 15 ms suffices,
 > but, then the generated tones seemed "off tune", so I've raised it to
 > the max. it will go to on my HW (8KB -- ~42 secs):
 
 Thank you.  I've just fixed it.
 
 A trivial correction for just future reference.
 tones < 100Hz is not related. (98Hz "O0G" worked).
 The buffersize was calculated indirectly from the beep's frequency
 and blk_ms.  I omit the details (since it is complicated), but if
 the resulted size becomes less than 32 bytes, then rounding down it
 by 32 bytes caused zero.
 
 > Maybe this will help narrow down what needs to be fixed in the
 > code.
 
 Anyway, thank you for your report!
 ---
 Tetsuya Isaki <isaki%pastel-flower.jp@localhost / isaki%NetBSD.org@localhost>