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Bug 486525
| Summary: | Pulseaudio disregards the --disable-shm command line option | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Darryl Bond <darryl.bond> |
| Component: | pulseaudio | Assignee: | Lennart Poettering <lpoetter> |
| Status: | CLOSED NOTABUG | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 10 | CC: | lkundrak, lpoetter, pierre-bugzilla, ryanryan52, wtogami |
| Target Milestone: | --- | Keywords: | Reopened |
| Target Release: | --- | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2009-02-26 16:01:27 UTC | Type: | --- |
| 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: | 188611 | ||
This is a misunderstanding --disable-shm only disables usage of SHM as transport. The PA internal memory allocation will still use a 64mb pool, allocating with mmap(). Note that even though we allocate 64mb initially this doesn't mean we actually use this memory. Due to how modern operating systems work this is only allocation of address space -- not of actual memory. The memory is only allocated when the memory is first accessed. Hence it should be fine to allocate that much even on systems with little memory. The only drawback of this logic is that pages are never handed back to the kernel this way: if memory is used once it stays in the pool and is never given back, however reused the next time. If this is a problem, shm-size-bytes is of help. Lennart, what is the drawback of using an exceedingly small shm-size-bytes like 1MB? 4MB? (Please go ahead and close again after you have answered this question.) TBH I have no idea what the real-life effect of that will be. If the pool is full PA will fallback to malloc() for allocating memory blocks. Hence I assume the effect is not that bad. Try to set it to 1MB and check if that works fine! BTW, I PA git now hands back those pages to the kernel when idle. I set the shm-size-bytes = 65536 (64kb) without any adverse effects that I can see (hear). Is it possible to set this option without using the conf file? Command line option? |
Description of problem: Pulse audio dies on LTSP clients with low memory Client is Fedora 10 LTSP. Version-Release number of selected component (if applicable): pulseaudio-0.9.14-1.fc10.i386 How reproducible: Pulseaudio dies on a thin client with 64MB of RAM which includes 8MB of Video RAM. The pulse audio startup script command is /usr/bin/pulseaudio --system \ --exit-idle-time=-1 \ --disable-shm=1 \ --no-cpu-limit \ --resample-method=trivial \ --high-priority \ -L module-detect \ -L "module-esound-protocol-tcp auth-anonymous=1" \ -L "module-native-protocol-tcp auth-anonymous=1" \ -L module-volume-restore \ -L module-rescue-streams \ -L module-native-protocol-unix \ -n Steps to Reproduce: 1. Boot the client 2. Check for running processes 3. Find that pulseaudio is not running Actual results: Re-running the command W: main.c: Running in system mode, but --disallow-exit not set! W: main.c: Running in system mode, but --disallow-module-loading not set! E: shm.c: mmap() failed: Cannot allocate memory E: core.c: pa_mempool_new() failed. E: main.c: pa_core_new() failed. From strace: open("/dev/shm/", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = 5 fstat64(5, {st_mode=S_IFDIR|0755, st_size=40, ...}) = 0 getdents64(5, /* 2 entries */, 4096) = 48 getdents64(5, /* 0 entries */, 4096) = 0 close(5) = 0 mmap2(NULL, 67108864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory) open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en_US.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory) ioctl(2, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0 write(2, "E: shm.c: \33[1;31mmmap() failed: C"..., 59E: shm.c: mmap() failed: Cannot allocate memory ) = 59 ioctl(2, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0 write(2, "E: core.c: \33[1;31mpa_mempool_new("..., 47E: core.c: pa_mempool_new() failed. ) = 47 ioctl(2, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0 write(2, "E: main.c: \33[1;31mpa_core_new() f"..., 44E: main.c: pa_core_new() failed. Note that even with --disable-shm and running in --system it tried to allocate 64MB RAM Expected results: pulse audio should take notice of the --disable-shm and --system flag and not use shared memory as documented in the man page Additional info: Adding the following lines to the pulse/daemon.conf file resolved the problem: disable-shm = yes shm-size-bytes = 1048576 # setting this 0 will use the system-default, usually 64 MiB I have not tried to optimise the shm-size-bytes just tried 1M and it worked.