netdev - Re: Fwd: Packet mmap: TX RING and zero copy

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Message-ID: <7e0dd21a0809050901q23d0b16xa1a9d0df2f36f6d8@mail.gmail.com>
Date:	Fri, 5 Sep 2008 18:01:46 +0200
From:	"Johann Baudy" <johaahn@...il.com>
To:	"Evgeniy Polyakov" <johnpol@....mipt.ru>
Cc:	netdev@...r.kernel.org
Subject: Re: Fwd: Packet mmap: TX RING and zero copy

Hi Evgeniy,

> Great, thank you. But it should take into account UDP nature: data is
> not allowed to be split between ip packets like with TCP.

I'm leaving office right now.
I'll come back toward you regarding this topic on Monday.

> Ethernet header is appended by the network core itself, likely core will
> just allocate skb with small data area, put there an ethernet and udp/ip
> headers and attach pages from the file. If hardware does not support
> checksumming and scatter/gather, things will be different.
>
>> App protocol must support packet loss ^^
>
> I think matter of packet loss relevance here is just the same like with
> any other sending method.
>

Ok, I see. I just need to check if UDP is fine for my application or
if i need to do my own L3/L4.

Many thanks again,
Have a nice weekend,

Johann

-- 
Johann Baudy
johaahn@...il.com
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