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Date: Wed, 21 Mar 2012 17:00:52 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: Vincent Li <vincent.mc.li@...il.com> Cc: netdev@...r.kernel.org Subject: Re: Piggyback the final ACK of the three way TCP connection establishment with the data On Wed, 2012-03-21 at 16:38 -0700, Vincent Li wrote: > Hi, > > I happen to see this link > http://h20000.www2.hp.com/bc/docs/support/SupportManual/c02020743/c02020743.pdf > and > > tcp_delay_final_twh_ack: > Piggyback the final ACK of the three way TCP connection > establishment with the data by delaying the final ack by > 10ms. > > 0: Send the final ACK as soon as the SYN+ACK packet > arrives from the remote host. > > 1: Delay the sending of the final ACK by 10ms. If > there is data available to be sent with in the > next 10ms, piggyback the ACK for the SYN. > [0-1] Default: 1 > > It appears this feature is not available in kernel tcp implementation, > is it trivial to make a custom patch to make this feature available? > can someone give a hint on how to make a patch for this? > > We had a situation that we want to make linux kernel tcp stack behave > this way so we can reproduce another issue at hand. > No kernel patch is needed, you already can do this on linux. Check file net/ipv4/tcp_input.c lines around 5722 -- 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
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