netdev - Re: [PATCH] allow to configure tcp_retries1 and tcp

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Date:	Thu, 10 Jun 2010 19:00:19 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Salvador Fandino <salvador@...del.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	linux-kernel@...stfloor.org, "@vger.kernel.org"@firstfloor.org
Subject: Re: [PATCH] allow to configure tcp_retries1 and tcp_retries2 per TCP socket

Salvador Fandino <salvador@...del.com> writes:


> The included patch adds support for setting the tcp_retries1 and
> tcp_retries2 options in a per socket fashion as it is done for the
> keepalive options TCP_KEEPIDLE, TCP_KEEPCNT and TCP_KEEPINTVL.
>
> The issue I am trying to solve is that when a socket has data queued for
> delivering, the keepalive logic is not triggered. Instead, the
> tcp_retries1/2 parameters are used to determine how many delivering
> attempts should be performed before giving up.

And why exactly do you need new tunables to solve this?

>
> The patch is very straight forward and just replicates similar
> functionality. There is one thing I am not completely sure and is if the
> new per-socket fields should go into inet_connection_sock instead of
> into tcp_sock.

tcp_sock is already quite big (>2k on 64bit) 

IMHO any new fields in there need very good justification.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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