[PATCH] [UBUNTU:sound/usb/] usb-audio: increase number of packets per URB

[crimsun at fungus.sh.nu]

From 9561f0014461a0956e1f6ddc010f94680ac82f8b Mon Sep 17 00:00:00 2001
From: Daniel T. Chen <crimsun at garnish.localdomain>
Date: Fri, 29 Sep 2006 20:47:37 -0400
Subject: [PATCH] [UBUNTU:sound/usb/] usb-audio: increase number of packets per URB

UpstreamStatus: Added in upstream alsa-kernel hg changeset:
		[31e98242d803] http://hg-mirror.alsa-project.org/alsa-kernel?cmd=changeset;node=31e98242d8031218ed3ed7fa62595a88fc8036ca;style=raw

This patch from Clemens Ladisch decreases the USB interrupts rate by
increasing both the default and the maximum number of packets per URB.

Suitable for application to both Dapper and Edgy linux-source.

Signed-off-by: Daniel T Chen <crimsun at ubuntu.com>
---
 sound/usb/usbaudio.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 6de5b6d..c0b78ce 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -67,7 +67,7 @@ static char *id[SNDRV_CARDS] = SNDRV_DEF
 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */
 static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; /* Vendor ID for this card */
 static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 }; /* Product ID for this card */
-static int nrpacks = 4;		/* max. number of packets per urb */
+static int nrpacks = 8;		/* max. number of packets per urb */
 static int async_unlink = 1;
 
 module_param_array(index, int, NULL, 0444);
@@ -96,7 +96,7 @@ MODULE_PARM_DESC(async_unlink, "Use asyn
  *
  */
 
-#define MAX_PACKS	10
+#define MAX_PACKS	20
 #define MAX_PACKS_HS	(MAX_PACKS * 8)	/* in high speed mode */
 #define MAX_URBS	8
 #define SYNC_URBS	4	/* always four urbs for sync */
-- 
1.4.1


-- 
Daniel T. Chen            crimsun at ubuntu.com
GPG key:  0xC88ABDA3
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