Excuse my ignorance, but what is meant by "doorbell" ?
-aW
0n Thu, Mar 05, 2009 at 12:09:47AM +0100, Hans Petter Selasky wrote:
>The new USB stack _is_ doing things faster than the old one. I have gone
>through a large range of tests before I landed on the doorbell trick.
>Actually the new USB stack doesn't use the doorbell, we use software
timers
>instead. The hardware certainly behaves different from vendor to vendor.
>Probably somone making the chips have to explain what is wrong.
>
>In my (Nvidia+AMD64+EHCI) test case I tried:
>
>No doorbell: 12 Mbyte/sec
>Doorbell after transfer (after QH removal): 14 Mbyte/sec
>Doorbell after next transfer (after QH insertion): 21 Mbyte/sec
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