在 2022/9/5 04:27, Michael S. Tsirkin 写道:
On Fri, Sep 02, 2022 at 03:36:25PM +0800, Heng Qi wrote:
We need to clarify that the purpose of header splitting is to make all payloads
can be independently in a page, which is beneficial for the zerocopy
implemented by the upper layer.
absolutely, pls add motivation.
If the driver does not enforce that the buffers submitted to the receiveq MUST
be composed of at least two descriptors, then header splitting will become
meaningless,
or the VIRTIO_NET_F_SPLIT_TRANSPORT_HEADER feature should not be negotiated at
this time.
Thanks.
This seems very narrow and unecessarily wasteful of descriptors.
What is wrong in this:
<header>...<padding>... <beginning of page><data>
seems to achieve the goal of data in a separate page without
using extra descriptors.
thus my proposal to replace the requirement of a separate
descriptor with an offset of data from beginning of
buffer that driver sets.
Not sure I get this, does it mean the header and padding are placed at
the tail of the previous adjacent page?
Thanks
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
