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add a tunable/sysctl, hw.snd.targetirqrate, to modify the default target

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irq rate for apps that do not set a blocksize.
This commit is contained in:
Cameron Grant 2001-09-18 14:45:09 +00:00
parent 5d91ad679d
commit a3a1ce3024
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=83613
2 changed files with 22 additions and 4 deletions
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24
sys/dev/sound/pcm/channel.c
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@ -42,6 +42,26 @@ SND_DECLARE_FILE("$FreeBSD$");
#define DEB(x) x
*/
static int chn_targetirqrate = 32;
TUNABLE_INT("hw.snd.targetirqrate", &chn_targetirqrate);
static int
sysctl_hw_snd_targetirqrate(SYSCTL_HANDLER_ARGS)
{
int err, val;
val = chn_targetirqrate;
err = sysctl_handle_int(oidp, &val, sizeof(val), req);
if (val < 16 || val > 512)
err = EINVAL;
else
chn_targetirqrate = val;
return err;
}
SYSCTL_PROC(_hw_snd, OID_AUTO, targetirqrate, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(int), sysctl_hw_snd_targetirqrate, "I", "");
static int chn_buildfeeder(struct pcm_channel *c);
static void
@ -678,7 +698,7 @@ chn_init(struct pcm_channel *c, void *devinfo, int dir)
}
chn_setdir(c, dir);
/* And the secondary bufhard. */
/* And the secondary buffer. */
sndbuf_setfmt(b, AFMT_U8);
sndbuf_setfmt(bs, AFMT_U8);
CHN_UNLOCK(c);
@ -859,7 +879,7 @@ chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz)
if (blksz == -1)
c->flags &= ~CHN_F_HAS_SIZE;
if (!(c->flags & CHN_F_HAS_SIZE)) {
blksz = (sndbuf_getbps(bs) * sndbuf_getspd(bs)) / CHN_DEFAULT_HZ;
blksz = (sndbuf_getbps(bs) * sndbuf_getspd(bs)) / chn_targetirqrate;
tmp = 32;
while (tmp <= blksz)
tmp <<= 1;

2
sys/dev/sound/pcm/channel.h
View File

@ -155,6 +155,4 @@ int fmtvalid(u_int32_t fmt, u_int32_t *fmtlist);
/* The size of a whole secondary bufhard. */
#define CHN_2NDBUFMAXSIZE (131072)
#define CHN_DEFAULT_HZ 50
#define CHANNEL_DECLARE(name) static DEFINE_CLASS(name, name ## _methods, sizeof(struct kobj))