Hi, thanks for your reply. Actually it is not a problem, I just want to avoid copying since it consumes power. However, since LwIP does copying for IPv6 I have no choice.
But does what you said mean that we will be facing issues with ICMP v4? On Tue, Aug 14, 2018 at 4:03 PM, [email protected] <[email protected]> wrote: > On 14.08.2018 14:49, Amena El Homsi wrote: > >> When we receive an echo request using IPv6, LwIP copies the request to >> new pbuf to send the reply. >> Why LwIP doesn't use the echo request pbuf, instead of allocating a new >> one (as what LwIP does when replying to IPv4 echo requests)? >> > > Ehrm, I don't know really. But the code for IPv4 has been there a really > long time and has cause some problems in the past. Also, using an RX buffer > for TX can be a problem because it can starve RX when all the buffers get > queued for TX and TX somehow stalls for some time (e.g. oending ARP request > or something like that). > > Is there a problem with copying the request for IPv6? > > Simon > > _______________________________________________ > lwip-users mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/lwip-users > -- Amena El-Homsi Computer & Communication Engineer Dipl. Eng, M.S.
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