On Mon, Jul 04, 2022 at 09:04:07AM +0200, Łukasz Spintzyk wrote: > DisplayLink ethernet devices require NTB buffers larger then 32kb in order to run with highest performance. > > Signed-off-by: Łukasz Spintzyk <lukasz.spintzyk@xxxxxxxxxxxxx> > --- > include/linux/usb/cdc_ncm.h | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/include/linux/usb/cdc_ncm.h b/include/linux/usb/cdc_ncm.h > index f7cb3ddce7fb..2d207cb4837d 100644 > --- a/include/linux/usb/cdc_ncm.h > +++ b/include/linux/usb/cdc_ncm.h > @@ -53,8 +53,8 @@ > #define USB_CDC_NCM_NDP32_LENGTH_MIN 0x20 > > /* Maximum NTB length */ > -#define CDC_NCM_NTB_MAX_SIZE_TX 32768 /* bytes */ > -#define CDC_NCM_NTB_MAX_SIZE_RX 32768 /* bytes */ > +#define CDC_NCM_NTB_MAX_SIZE_TX 65536 /* bytes */ > +#define CDC_NCM_NTB_MAX_SIZE_RX 65536 /* bytes */ Does this mess with the throughput of older devices that are not on displaylink connections? What devices did you test this on, and what is the actual performance changes? You offer no real information here at all, and large buffer sizes does have other downsides, so determining how you tested this is key. Also, please wrap your changelogs at 72 columns like git asks you to do. thanks, greg k-h
