netdev - Re: [PATCH] tcp: account SYN-ACK timeouts & retransmissions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 11 Jan 2010 16:15:37 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	opurdila@...acom.com
Cc:	netdev@...r.kernel.org, mpyatkovskiy@...acom.com
Subject: Re: [PATCH] tcp: account SYN-ACK timeouts & retransmissions

From: Octavian Purdila <opurdila@...acom.com>
Date: Tue, 12 Jan 2010 00:16:33 +0200

> On Friday 08 January 2010 03:25:07 you wrote:
>> From: Octavian Purdila <opurdila@...acom.com>
>> Date: Wed,  6 Jan 2010 22:10:58 +0200
>> 
>> > Signed-off-by: Maksim Pyatkovskiy <mpyatkovskiy@...acom.com>
>> > Signed-off-by: Octavian Purdila <opurdila@...acom.com>
>> 
>> RETRANSSEGS is meant to count data segments retransmits, not pure
>> control frames.
>> 
>> Similarly for TCPTIMEOUTS, it's mean for data retransmit timeouts.
>> 
>> If you overload these statistics with other similar events, they
>> become less meaningful.
>> 
> 
> But we do increment RETRANSSEGS & TCPTIMEOUTS for SYNs. This creates an 
> imbalance in client/server stats which makes things harder to diagnose.

Interesting.

Can you do me a favor and look into the code history and see
if we used to account both sides?

I wonder if we accidently lost the statistic bumps when the
generic inet connection socket layer was added.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html