diff options
| author | ariff <ariff@FreeBSD.org> | 2005-12-30 07:33:28 +0000 |
|---|---|---|
| committer | ariff <ariff@FreeBSD.org> | 2005-12-30 07:33:28 +0000 |
| commit | b5131ef2293e511aed3e8c55a5e9b644f19630a0 (patch) | |
| tree | ecf93fe2e9f17e49a39119597b39726efd21082d /sys | |
| parent | 904d3f4de5eabd5a7ecb1f7fdc712b4ad55dec35 (diff) | |
| download | FreeBSD-src-b5131ef2293e511aed3e8c55a5e9b644f19630a0.zip FreeBSD-src-b5131ef2293e511aed3e8c55a5e9b644f19630a0.tar.gz | |
Disable frantic DMA update within few SNDCTL_DSP_* ioctl.
This should reduce huge playback / recording latency for
applications that try to act smarter and manage their own
buffering (XMMS, Skype, etc.).
Note to Skype + via8xxx users: Remove previous hackish
"hint.pcm.<unit>.via_dxs_disabled" from kernel hint and see
whether this changes cure all those annoying sound issues.
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/dev/sound/pcm/dsp.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/sys/dev/sound/pcm/dsp.c b/sys/dev/sound/pcm/dsp.c index 1bedd06..27fed2e 100644 --- a/sys/dev/sound/pcm/dsp.c +++ b/sys/dev/sound/pcm/dsp.c @@ -879,7 +879,7 @@ dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode, struct thread * struct snd_dbuf *bs = wrch->bufsoft; CHN_LOCK(wrch); - chn_wrupdate(wrch); + /* XXX abusive DMA update: chn_wrupdate(wrch); */ a->bytes = sndbuf_getfree(bs); a->fragments = a->bytes / sndbuf_getblksz(bs); a->fragstotal = sndbuf_getblkcnt(bs); @@ -896,7 +896,7 @@ dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode, struct thread * struct snd_dbuf *bs = rdch->bufsoft; CHN_LOCK(rdch); - chn_rdupdate(rdch); + /* XXX abusive DMA update: chn_rdupdate(rdch); */ a->bytes = sndbuf_gettotal(bs); a->blocks = sndbuf_getblocks(bs) - rdch->blocks; a->ptr = sndbuf_getreadyptr(bs); @@ -914,7 +914,7 @@ dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode, struct thread * struct snd_dbuf *bs = wrch->bufsoft; CHN_LOCK(wrch); - chn_wrupdate(wrch); + /* XXX abusive DMA update: chn_wrupdate(wrch); */ a->bytes = sndbuf_gettotal(bs); a->blocks = sndbuf_getblocks(bs) - wrch->blocks; a->ptr = sndbuf_getreadyptr(bs); @@ -990,7 +990,7 @@ dsp_ioctl(struct cdev *i_dev, u_long cmd, caddr_t arg, int mode, struct thread * struct snd_dbuf *bs = wrch->bufsoft; CHN_LOCK(wrch); - chn_wrupdate(wrch); + /* XXX abusive DMA update: chn_wrupdate(wrch); */ *arg_i = sndbuf_getready(b) + sndbuf_getready(bs); CHN_UNLOCK(wrch); } else |
