> Well, for the 10/100 MACB interface, I am stuck with 128 Bytes buffers!
> So this use of pages seems sensible.
If you have dma coherent memory you can make the rx buffer space
be an array of short buffers referenced by adjacent ring entries
(possibly with the last one slightly short to allow
On 12/05/2012 10:35 AM, David Laight :
>> If I understand well, you mean that the call to:
>>
>> dma_sync_single_range_for_device(>pdev->dev, phys,
>> pg_offset, frag_len, DMA_FROM_DEVICE);
>>
>> in the rx path after having copied the data to skb is not
> If I understand well, you mean that the call to:
>
> dma_sync_single_range_for_device(>pdev->dev, phys,
> pg_offset, frag_len, DMA_FROM_DEVICE);
>
> in the rx path after having copied the data to skb is not needed?
> That is also the conclusion that
If I understand well, you mean that the call to:
dma_sync_single_range_for_device(bp-pdev-dev, phys,
pg_offset, frag_len, DMA_FROM_DEVICE);
in the rx path after having copied the data to skb is not needed?
That is also the conclusion that I
On 12/05/2012 10:35 AM, David Laight :
If I understand well, you mean that the call to:
dma_sync_single_range_for_device(bp-pdev-dev, phys,
pg_offset, frag_len, DMA_FROM_DEVICE);
in the rx path after having copied the data to skb is not needed?
That
Well, for the 10/100 MACB interface, I am stuck with 128 Bytes buffers!
So this use of pages seems sensible.
If you have dma coherent memory you can make the rx buffer space
be an array of short buffers referenced by adjacent ring entries
(possibly with the last one slightly short to allow for
On 12/03/2012 03:25 PM, David Laight :
>> On 12/03/2012 01:43 PM, David Laight :
Allocate regular pages to use as backing for the RX ring and use the
DMA API to sync the caches. This should give a bit better performance
since it allows the CPU to do burst transfers from memory. It
On 12/03/2012 03:25 PM, David Laight :
On 12/03/2012 01:43 PM, David Laight :
Allocate regular pages to use as backing for the RX ring and use the
DMA API to sync the caches. This should give a bit better performance
since it allows the CPU to do burst transfers from memory. It is also
a
> On 12/03/2012 01:43 PM, David Laight :
> >> Allocate regular pages to use as backing for the RX ring and use the
> >> DMA API to sync the caches. This should give a bit better performance
> >> since it allows the CPU to do burst transfers from memory. It is also
> >> a necessary step on the way
On 12/03/2012 01:43 PM, David Laight :
>> Allocate regular pages to use as backing for the RX ring and use the
>> DMA API to sync the caches. This should give a bit better performance
>> since it allows the CPU to do burst transfers from memory. It is also
>> a necessary step on the way to reduce
> Allocate regular pages to use as backing for the RX ring and use the
> DMA API to sync the caches. This should give a bit better performance
> since it allows the CPU to do burst transfers from memory. It is also
> a necessary step on the way to reduce the amount of copying done by
> the driver.
Allocate regular pages to use as backing for the RX ring and use the
DMA API to sync the caches. This should give a bit better performance
since it allows the CPU to do burst transfers from memory. It is also
a necessary step on the way to reduce the amount of copying done by
the driver.
On 12/03/2012 01:43 PM, David Laight :
Allocate regular pages to use as backing for the RX ring and use the
DMA API to sync the caches. This should give a bit better performance
since it allows the CPU to do burst transfers from memory. It is also
a necessary step on the way to reduce the
On 12/03/2012 01:43 PM, David Laight :
Allocate regular pages to use as backing for the RX ring and use the
DMA API to sync the caches. This should give a bit better performance
since it allows the CPU to do burst transfers from memory. It is also
a necessary step on the way to reduce the
14 matches
Mail list logo
