On 2018/12/13 3:09, David Miller wrote:
> From: jiangyiwen <jiangyiwen@xxxxxxxxxx>
> Date: Wed, 12 Dec 2018 17:29:31 +0800
>
>> diff --git a/include/uapi/linux/virtio_vsock.h b/include/uapi/linux/virtio_vsock.h
>> index 1d57ed3..2292f30 100644
>> --- a/include/uapi/linux/virtio_vsock.h
>> +++ b/include/uapi/linux/virtio_vsock.h
>> @@ -63,6 +63,11 @@ struct virtio_vsock_hdr {
>> __le32 fwd_cnt;
>> } __attribute__((packed));
>>
>> +/* It add mergeable rx buffers feature */
>> +struct virtio_vsock_mrg_rxbuf_hdr {
>> + __le16 num_buffers; /* number of mergeable rx buffers */
>> +} __attribute__((packed));
>> +
>
> I know the rest of this file uses 'packed' but this attribute should
> only be used if absolutely necessary as it incurs a
> non-trivial performance penalty for some architectures.
>
> .
>
Hi David,
I hope Host can fill fewer bytes into rx virtqueue, so
I keep structure virtio_vsock_mrg_rxbuf_hdr one byte
alignment.
Thanks,
Yiwen.
