netdev - Re: [PATCHv2 net-next 0/4] Small fix for TCP PMTU

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Date:	Fri, 27 Feb 2015 13:37:44 +0800
From:	Fan Du <fengyuleidian0615@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
CC:	'Fan Du' <fan.du@...el.com>,
	"johnwheffner@...il.com" <johnwheffner@...il.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCHv2 net-next 0/4] Small fix for TCP PMTU

于 2015年02月26日 21:40, David Laight 写道:
> From: Fan Du
>> >This patchset performs some small fix and enhancement
>> >for current TCP PMTU as per RFC4821 with below changes:
>> >
>> >Patch1/4: Set probe mss base to 1024 Bytes per RFC4821
>> >Patch2/4: Do not double probe_size for each probing,
>> >           use a simple binary search to gain maximum performance.
>> >Patch3/4: When it comes to blackhole detection, shrink current
>> >	  mss for next probing.
>> >Patch4/4: Create a probe timer to detect enlarged path MTU.
> Isn't the most likely problem PPPoE blackholes?
No.

It's used to probe a optimal pmtu value for vxlan tunnel when ICMP message
is not available. Refer patch2/4 for test summary.

> Where a reduction of the PMTU from 1500 to (IIRC) 1492 is
> all that is required?
>
> Would seem appropriate to test that value reasonable quickly.

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