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authorDevin Heitmueller <dheitmueller@kernellabs.com>2010-01-22 01:53:17 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2010-05-18 00:50:13 -0300
commit33c02facb5a3123212587295cc1c241ee7e03adb (patch)
tree4a8beb803b8210624f76be000170fe684fd70244 /drivers/media/video/em28xx
parentf0dbf82bf1ff97c24af228328fb21c93fcfcb983 (diff)
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 <dheitmueller@kernellabs.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/em28xx')
-rw-r--r--drivers/media/video/em28xx/em28xx.h4
1 files changed, 2 insertions, 2 deletions
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