A NOTE has been added to this issue. ====================================================================== <https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1869> ====================================================================== Reported By: bitmage2 Assigned To: ====================================================================== Project: ALSA - driver Issue ID: 1869 Category: CORE - pcm Reproducibility: always Severity: minor Priority: normal Status: new Distribution: SuSE Linux 10.0 Kernel Version: Linux 2.6.13-15.8-default #1 Tue Feb 7 11:07:24 UTC 2006 i686 athlon i386 GNU/Linux ====================================================================== Date Submitted: 02-23-2006 00:48 CET Last Modified: 07-24-2006 20:38 CEST ====================================================================== Summary: Playing surround sound produces 100% CPU load Description: I am using the CS46xx with a Hercules Gametheater XP 5.1 . It plays back stereo without problems. I wanted to use the rest of my 5.1 speaker set, so for a test I ran the speaker-test program. Running it without parameters or with 2 or 4.0 channels works also fine. So far so good. But when I run it with 5.0 channels or 5.1 channels the CPU load of speaker-test goes to 100%. I'll show the output of top along with the command lines below (for the 2.0 and 5.1 case) in the "Additional Information" box. ====================================================================== ---------------------------------------------------------------------- Raymond - 07-24-06 05:04 ---------------------------------------------------------------------- It seem that the lock in CS46xx.pcm.rear may has side effect since the rear device of CS46xx support hardware mixing ( multiple subdevice ) https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1823 hooks.0 { type ctl_elems hook_args [ { name "Duplicate Front" lock true preserve true value 0 optional true } ] } Are there any difference in calulating the period_size, period and buffer_size surround40 , surround51 for cs46xx (multi plugin with front, rear and center_lfe) and ice1724 ( single device support 2,4,6,8 channels ) ? https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2244 ---------------------------------------------------------------------- bitmage2 - 07-24-06 20:38 ---------------------------------------------------------------------- I just validated, that the problem is still there in 1.0.12rc1 . I did install that version on a clean linux installation. I also did a "strace speaker-test ...". While everything works fine, it looks like this: ... poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL, revents=POLLOUT}], 1, -1) = 1 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL, revents=POLLOUT}], 1, -1) = 1 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL, revents=POLLOUT}], 1, -1) = 1 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 poll([{fd=4, events=POLLOUT|POLLERR|POLLNVAL, revents=POLLOUT}], 1, -1) = 1 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ... When the problem shows up, the strace output is this (not calling poll() anymore): ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ioctl(4, 0x4122, 0xbfeb2ab8) = 0 ... Issue History Date Modified Username Field Change ====================================================================== 02-23-06 00:48 bitmage2 New Issue 02-23-06 00:48 bitmage2 Distribution => SuSE Linux 10.0 02-23-06 00:48 bitmage2 Kernel Version => Linux 2.6.13-15.8-default #1 Tue Feb 7 11:07:24 UTC 2006 i686 athlon i386 GNU/Linux 02-23-06 00:54 bitmage2 Note Added: 0008164 02-23-06 00:55 bitmage2 Issue Monitored: bitmage2 07-11-06 05:58 Raymond Note Added: 0010964 07-14-06 20:57 bitmage2 Note Added: 0011004 07-14-06 20:59 bitmage2 Note Added: 0011005 07-14-06 21:25 rlrevell Note Added: 0011006 07-14-06 22:40 bitmage2 Note Added: 0011008 07-14-06 22:57 rlrevell Note Added: 0011009 07-15-06 01:28 bitmage2 Note Added: 0011013 07-15-06 01:45 rlrevell Note Added: 0011014 07-15-06 05:09 Raymond Note Added: 0011017 07-15-06 07:17 Raymond Note Edited: 0011017 07-23-06 11:34 bitmage2 Note Added: 0011183 07-23-06 13:49 Raymond Note Added: 0011185 07-23-06 14:14 Raymond Note Added: 0011186 07-23-06 14:16 Raymond Note Deleted: 0011186 07-23-06 15:04 bitmage2 Note Added: 0011189 07-24-06 04:19 Raymond Note Added: 0011209 07-24-06 05:04 Raymond Note Edited: 0011209 07-24-06 20:38 bitmage2 Note Added: 0011214 ====================================================================== ------------------------------------------------------------------------- Take Surveys. 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