ixp4xx dmabounce

Brian Walsh brian at walsh.ws
Thu Sep 24 12:57:29 EDT 2009

On Thu, Sep 24, 2009 at 12:51 PM, Krzysztof Halasa <khc at pm.waw.pl> wrote:
> Brian Walsh <brian at walsh.ws> writes:
>> I tried Krzysztof's patch and it had no noticeable affect.  I am still getting
>> about 6.3 Mbps IP data throughput when only using the ohci controller and
>> about 3.6 Mbps when the device is attached to the ehci controller.  This
>> device works fine when running the same testing attached to an x86
>> configured machine and gets about 18 Mbps IP data throughput.
> I assume you've enabled CONFIG_ZONE_DMA_ALL_KERNEL :-)
> Either the bouncing isn't the problem in this case, or the allocations
> are GFP_USER.
> --
> Krzysztof Halasa

Ha.  Yes, I did enable that option.

I am doing my testing just by using wget to pull a file over the connection.

More information about the linux-arm-kernel mailing list