RE : RE : [lwip-devel] Speed up lwIP

[Frédéric BERNON]

>You can also replace all sys_mbox_fetch calls per sys_arch_mbox_fetch
And you also can replace the old sys_mbox_fetch (patched fy recv_timeout). But don't forget that some people want to keep the possibility to use sys_timeouts at "application level". But I think it's a bad idea to use internal lwip feature, "outside" lwip.

 

>sys_timeout ...The code would stay the same, you would only save one function call

Yes, but this call is not "cheap", and is in tcpip_thread, and, with arp, dhcp fine, dhcp coarse, igmp, ip, there is lot of time spend in sys_timeout... I will study something about that...

 

 

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Frédéric BERNON
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P Avant d'imprimer, penser à l'environnement

 

-----Message d'origine-----
De : Goldschmidt Simon [mailto:address@hidden
Envoyé : dimanche 6 mai 2007 16:10
À : Frédéric BERNON; address@hidden
Objet : AW: RE : [lwip-devel] Speed up lwIP

>Could be replace by :
>#define api_msg_post(msg) tcpip_apimsg(msg)

That's certainly true. I would instead use tcpip_callback() but the effect (saving one function call) would be the same.

>You can also replace all sys_mbox_fetch calls per sys_arch_mbox_fetch
>(except in tcpip_thread) if you don't need to use "timeouts" at
>application level (you also avoid some problems)

I would definitivley change this, yes.

>sys_timeout also need to be optimize: most of time, a sys_timeout's
>handler recall sys_timeout. I think there is something to do on this
>point...

You mean to have something like a periodic timer which does not have to be set up again every time? I think that's not too necessary. You would do the re-setup in sys_mbox_fetch() instead of in the timer callback. The code would stay the same, you would only save one function call. And looking at the timer intervals (100ms is the least), that's not too much...

Frédéric BERNON.vcf
Description: Frédéric BERNON.vcf