lkml.org 
[lkml]   [2012]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 1/1] tcp: Wrong timeout for SYN segments
From
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 31 Aug 2012 06:25:50 -0700

> On Fri, 2012-08-31 at 14:48 +0200, Alexander Bergmann wrote:
>
>> Hi Eric!
>>
>> I've also changed the Documentation file. As usual, comments are welcome!
>>
>>
>> Alex
>>
>>
>> From 848f34ce27f65401940ae98e0b2d395888d3986d Mon Sep 17 00:00:00 2001
>> From: Alexander Bergmann <alex@linlab.net>
>> Date: Fri, 31 Aug 2012 14:31:00 +0200
>> Subject: [PATCH 1/1] tcp: Increase timeout for SYN segments
>>
>> Commit 9ad7c049 changed the initRTO from 3secs to 1sec in accordance to
>> RFC6298 (former RFC2988bis). This reduced the time till the last SYN
>> retransmission packet gets sent from 93secs to 31secs.
>>
>> RFC1122 is stating that the retransmission should be done for at least 3
>> minutes, but this seems to be quite high.
>>
>> "However, the values of R1 and R2 may be different for SYN
>> and data segments. In particular, R2 for a SYN segment MUST
>> be set large enough to provide retransmission of the segment
>> for at least 3 minutes. The application can close the
>> connection (i.e., give up on the open attempt) sooner, of
>> course."
>>
>> This patch increases the value of TCP_SYN_RETRIES to the value of 6,
>> providing a retransmission window of 63secs.
>>
>> The comments for SYN and SYNACK retries have also been updated to
>> describe the current settings. The same goes for the documentation file
>> "Documentation/networking/ip-sysctl.txt".
>>
>> Signed-off-by: Alexander Bergmann <alex@linlab.net>
>> ---
>
> Thanks for your patience and followup, this seems good to me !
>
> Acked-by: Eric Dumazet <edumazet@google.com>

Applied with some minor comment formatting and wording adjustments.

Thanks everyone.


\
 
 \ /
  Last update: 2012-08-31 22:21    [W:0.041 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site