On 4/7/21 7:49 AM, Xuan Zhuo wrote:
> In page_to_skb(), if we have enough tailroom to save skb_shared_info, we
> can use build_skb to create skb directly. No need to alloc for
> additional space. And it can save a 'frags slot', which is very friendly
> to GRO.
>
> Here, if the payload of the received package is too small (less than
> GOOD_COPY_LEN), we still choose to copy it directly to the space got by
> napi_alloc_skb. So we can reuse these pages.
>
> Testing Machine:
> The four queues of the network card are bound to the cpu1.
>
> Test command:
> for ((i=0;i<5;++i)); do sockperf tp --ip 192.168.122.64 -m 1000 -t 150& done
>
> The size of the udp package is 1000, so in the case of this patch, there
> will always be enough tailroom to use build_skb. The sent udp packet
> will be discarded because there is no port to receive it. The irqsoftd
> of the machine is 100%, we observe the received quantity displayed by
> sar -n DEV 1:
>
> no build_skb: 956864.00 rxpck/s
> build_skb: 1158465.00 rxpck/s
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> Suggested-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
This will generate merge conflicts.
Please wait that commit 0f6925b3e8da ("virtio_net: Do not pull payload in skb->head") has reached net-next.
Also are we sure pages are always writable, and not shared ?
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