Commit 33c02fac authored by Devin Heitmueller's avatar Devin Heitmueller Committed by Mauro Carvalho Chehab
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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: default avatarDevin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent f0dbf82b

drivers/media/video/em28xx/em28xx.h

+2 −2
Original line number Diff line number Diff line
@@ -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