netdev - Re: Faster TCP keepalive

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Message-ID: <269605029.27220992.1498504897374.JavaMail.zimbra@redhat.com>
Date:   Mon, 26 Jun 2017 15:21:37 -0400 (EDT)
From:   Lance Richardson <lrichard@...hat.com>
To:     Stephen Suryaputra Lin <stephen.suryaputra.lin@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: Faster TCP keepalive

> From: "Stephen Suryaputra Lin" <stephen.suryaputra.lin@...il.com>
> To: netdev@...r.kernel.org
> Sent: Friday, 23 June, 2017 3:58:17 PM
> Subject: Faster TCP keepalive
> 
> Greetings,
> 
> I'm writing this to probe if there has been thoughts or efforts in
> allowing sub-second TCP keep alive interval? One application is for TCP
> connections between IP hosts connected by an internal backplane where a
> faster detection is a necessity and the increased traffic can be
> accommodated.
> 
> Suggestions on other ways to quickly tearing down TCP connections to a
> rebooted host in the application above are welcomed.
> 

For quickly tearing down TCP connections to a host that has been rebooted,
avoiding e.g. waiting for TCP max retransmit count to be reached), you
could use SOCK_DESTROY (as e.g. iproute2's "ss -K [ FILTER ]" does).

Regards,

  Lance

> Thank you,
> 
> Stephen.
>