diff options
| author | Devin Heitmueller <dheitmueller@kernellabs.com> | 2010-01-21 23:53:17 -0500 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-05-17 23:50:13 -0400 |
| commit | 33c02facb5a3123212587295cc1c241ee7e03adb (patch) | |
| tree | 4a8beb803b8210624f76be000170fe684fd70244 /drivers | |
| parent | f0dbf82bf1ff97c24af228328fb21c93fcfcb983 (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')
| -rw-r--r-- | drivers/media/video/em28xx/em28xx.h | 4 |
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 @@ | |||
| 140 | #define EM28XX_NUM_BUFS 5 | 140 | #define EM28XX_NUM_BUFS 5 |
| 141 | 141 | ||
| 142 | /* number of packets for each buffer | 142 | /* number of packets for each buffer |
| 143 | windows requests only 40 packets .. so we better do the same | 143 | windows requests only 64 packets .. so we better do the same |
| 144 | this is what I found out for all alternate numbers there! | 144 | this is what I found out for all alternate numbers there! |
| 145 | */ | 145 | */ |
| 146 | #define EM28XX_NUM_PACKETS 40 | 146 | #define EM28XX_NUM_PACKETS 64 |
| 147 | 147 | ||
| 148 | #define EM28XX_INTERLACED_DEFAULT 1 | 148 | #define EM28XX_INTERLACED_DEFAULT 1 |
| 149 | 149 | ||