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]

Message-Id: <201001120016.33550.opurdila@ixiacom.com>
Date:	Tue, 12 Jan 2010 00:16:33 +0200
From:	Octavian Purdila <opurdila@...acom.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, mpyatkovskiy@...acom.com
Subject: Re: [PATCH] tcp: account SYN-ACK timeouts & retransmissions

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.

> Finally, bumping TCP specific statistics from the generic INET
> connection oriented socket code is a huge no-no.  That code is
> written to be protocol agnostic.
> 

Fair point, I'll fix that up in the next version.
--
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