[PATCH] b43legacy: dma: cache translation (routing bits)

[Larry Finger]

On 07/21/2011 05:25 PM, Rafał Miłecki wrote:
>
> Signed-off-by: Rafał Miłecki<zajec5 at gmail.com>
> ---
> Ideally this should have been applied before:
> ssb: return correct translation bit for 64-bit DMA
>
> This is because mentioned patch added TMSHIGH register read on every
> ssb_dma_translation call which affected performance.
>
> If we can live with affected performance between that 2 commits, please
> just apply this ASAP.
>
> It affected performance (however I don't expect anything like making it
> 90% slower) is not acceptable, please revert mentioned patch, apply this
> one and then re-apply reverted patches.
> ---

Tested-by: Larry Finger <Larry.Finger at lwfinger.net>

The patch is fine. In fact, I didn't notice much difference in CPU usage in the 
before/after tests; however, my b43legacy device only handles 802.11b, thus 
there are not a lot of packets per second.

The failure to boot with the latest pull is more problematic. My bisection try 
led to the nonsensical result of a branch commit. I will pull mainline 3.0 to 
see if it has the same problem.

Larry