Hi,
On Fri, Mar 11, 2016 at 6:54 AM, Felipe Balbi
<felipe.balbi@xxxxxxxxxxxxxxx> wrote:
> previously we were using a maximum of 32 TRBs per
> endpoint. With each TRB being 16 bytes long, we were
> using 512 bytes of memory for each endpoint.
>
> However, SLAB/SLUB will always allocate PAGE_SIZE
> chunks. In order to better utilize the memory we
> allocate and to allow deeper queues for gadgets
> which would benefit from it (g_ether comes to mind),
> let's increase the maximum to 256 TRBs which rounds
> up to 4096 bytes for each endpoint.
Do we want to increase the same for event ring buffers as
while, which is allocated by dma_alloc_coherent(), which
is also at PAGE_SIZE chunks, right?
Regards,
-Bin.
>
> Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
> ---
> drivers/usb/dwc3/core.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index e4f8b90d9627..bf05cca96941 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -435,7 +435,7 @@ struct dwc3_event_buffer {
> #define DWC3_EP_DIRECTION_TX true
> #define DWC3_EP_DIRECTION_RX false
>
> -#define DWC3_TRB_NUM 32
> +#define DWC3_TRB_NUM 256
> #define DWC3_TRB_MASK (DWC3_TRB_NUM - 1)
>
> /**
> --
> 2.7.0.GIT
>
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