From: Devin Heitmueller Date: Fri, 22 Jan 2010 04:53:17 +0000 (-0300) Subject: V4L/DVB: em28xx: adjust number of packets per URB X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=33c02facb5a3123212587295cc1c241ee7e03adb;p=linux-beck.git V4L/DVB: em28xx: adjust number of packets per URB Increase the packets per URB count from 40 to 64. I suspect that whoever was looking at the usbsnoop captures saw "0x40" packets and mistook it for "40". As a result of this change, I can see a 25% reduction in the number of interrupts generated via powertop. This work was sponsored by EyeMagnet Limited. Signed-off-by: Devin Heitmueller Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/em28xx/em28xx.h b/drivers/media/video/em28xx/em28xx.h index ba6fe5daff84..526c06582158 100644 --- a/drivers/media/video/em28xx/em28xx.h +++ b/drivers/media/video/em28xx/em28xx.h @@ -140,10 +140,10 @@ #define EM28XX_NUM_BUFS 5 /* number of packets for each buffer - windows requests only 40 packets .. so we better do the same + windows requests only 64 packets .. so we better do the same this is what I found out for all alternate numbers there! */ -#define EM28XX_NUM_PACKETS 40 +#define EM28XX_NUM_PACKETS 64 #define EM28XX_INTERLACED_DEFAULT 1