netdev - Re: [RFC] tcp: Export TCP Delayed ACK parameters to user

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:	Fri, 28 Oct 2011 11:01:51 +0300
From:	Daniel Baluta <daniel.baluta@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org
Subject: Re: [RFC] tcp: Export TCP Delayed ACK parameters to user

On Fri, Oct 28, 2011 at 3:01 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le vendredi 28 octobre 2011 à 02:07 +0300, Daniel Baluta a écrit :
>> RFC2581 ($4.2) specifies when an ACK should be generated as follows:
>>
>> " .. an ACK SHOULD be generated for at least every second
>>   full-sized segment, and MUST be generated within 500 ms
>>   of the arrival of the first unacknowledged packet.
>> "
>>
>> We export the number of segments and the timeout limits
>> specified above, so that a user can tune them according
>> to its needs.
>>
>
> Well, this requires user has a machine exclusive use :)

So, this means that setting parameters system wide
isn't an option?

On Windows there is a global setting TcpAckFrequency [1],
which is similar with our tcp_delack_{min,max}.

On Solaris there is a global option tcp_deferred_acks_max [2],
which is similar with our tcp_delack_segs.

Thanks for your comments, I will post an updated patch asap.

Daniel.

[1] http://support.microsoft.com/kb/328890
[2] http://www.sean.de/Solaris/soltune.html
--
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