netdev - Re: [PATCH] fragment: add fast path

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Date:	Mon, 14 Jun 2010 11:24:14 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To:	Changli Gao <xiaosuo@...il.com>
CC:	David Miller <davem@...emloft.net>, kuznet@....inr.ac.ru,
	pekkas@...core.fi, jmorris@...ei.org, kaber@...sh.net,
	netdev@...r.kernel.org, YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH] fragment: add fast path

NIC?

--yoshfuji

(2010/06/14 11:03), Changli Gao wrote:
> On Mon, Jun 14, 2010 at 9:18 AM, David Miller<davem@...emloft.net>  wrote:
>> From: Changli Gao<xiaosuo@...il.com>
>> Date: Mon, 14 Jun 2010 07:16:35 +0800
>>
>>> As the fragments are usually in order,
>>
>> In what universe does this happen "usually"?
>>
>> Linux has been outputting fragments in reverse order for more than 10
>> years.
>>
>
> I have tested next-next-2.6 and darwin, and found they are both send
> fragments in order:
>
> Darwin:
>
> Darwin localhost 9.8.0 Darwin Kernel Version 9.8.0: Wed Jul 15
> 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386 i386
>
> 09:53:26.891820 IP (tos 0x0, ttl 64, id 19628, offset 0, flags [+],
> proto UDP (17), length 1500) 10.13.3.10.52189>  10.13.150.1.8888: UDP,
> length 8192
> 09:53:26.892048 IP (tos 0x0, ttl 64, id 19628, offset 1480, flags [+],
> proto UDP (17), length 1500) 10.13.3.10>  10.13.150.1: udp
> 09:53:26.892229 IP (tos 0x0, ttl 64, id 19628, offset 2960, flags [+],
> proto UDP (17), length 1500) 10.13.3.10>  10.13.150.1: udp
> 09:53:26.892397 IP (tos 0x0, ttl 64, id 19628, offset 4440, flags [+],
> proto UDP (17), length 1500) 10.13.3.10>  10.13.150.1: udp
> 09:53:26.892529 IP (tos 0x0, ttl 64, id 19628, offset 5920, flags [+],
> proto UDP (17), length 1500) 10.13.3.10>  10.13.150.1: udp
> 09:53:26.892670 IP (tos 0x0, ttl 64, id 19628, offset 7400, flags
> [none], proto UDP (17), length 820) 10.13.3.10>  10.13.150.1: udp
>
> Linux:
>
> Linux localhost 2.6.35-rc1 #88 SMP Sun Jun 13 14:25:07 CST 2010 x86_64
> Intel(R) Core(TM)2 Duo CPU E6550 @ 2.33GHz GenuineIntel GNU/Linux
>
> 08:01:53.730902 IP (tos 0x0, ttl 64, id 1263, offset 0, flags [+],
> proto UDP (17), length 1500) 10.13.150.50.45295>  10.13.150.1.8888:
> UDP, length 8192
> 08:01:53.730955 IP (tos 0x0, ttl 64, id 1263, offset 1480, flags [+],
> proto UDP (17), length 1500) 10.13.150.50>  10.13.150.1: udp
> 08:01:53.731113 IP (tos 0x0, ttl 64, id 1263, offset 2960, flags [+],
> proto UDP (17), length 1500) 10.13.150.50>  10.13.150.1: udp
> 08:01:53.731139 IP (tos 0x0, ttl 64, id 1263, offset 4440, flags [+],
> proto UDP (17), length 1500) 10.13.150.50>  10.13.150.1: udp
> 08:01:53.731280 IP (tos 0x0, ttl 64, id 1263, offset 5920, flags [+],
> proto UDP (17), length 1500) 10.13.150.50>  10.13.150.1: udp
> 08:01:53.731306 IP (tos 0x0, ttl 64, id 1263, offset 7400, flags
> [none], proto UDP (17), length 820) 10.13.150.50>  10.13.150.1: udp
>
> Later I'll test Windows.
>

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