netdev - Re: [PATCH 1/2] [TCP]: Also handle snd_una changes in tcp_cwnd

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Date:	Thu, 2 Aug 2007 14:18:59 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	David Miller <davem@...emloft.net>
cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/2] [TCP]: Also handle snd_una changes in tcp_cwnd_down

On Wed, 1 Aug 2007, Ilpo Järvinen wrote:

> 
> tcp_cwnd_down must check for it too as it should be conservative
> in case of collapse stuff and also when receiver is trying to
> lie (though that wouldn't be very successful/useful anyway).
> 
> Note:
> - Separated also is_dupack and do_lost in fast_retransalert
> 	* Much cleaner look-and-feel now
> 	* This time it really fixes cumulative ACK with many new
> 	  SACK blocks recovery entry (I claimed this fixes with
> 	  last patch but it wasn't). TCP will now call
> 	  tcp_update_scoreboard regardless of is_dupack when
> 	  in recovery as long as there is enough fackets_out.
> - Introduce FLAG_SND_UNA_ADVANCED
> 	* Some prior_snd_una arguments are unnecessary after it
> - Added helper FLAG_ANY_PROGRESS to avoid long FLAG...|FLAG...
>   constructs
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
> ---
> 
> Dave, BEWARE, I wasn't able to do anything else but compile test
> because Linus' tree didn't seem to boot on the machine I was
> trying to test it... :-(
> 
> I think that to stable version only a small part of this change
> is necessary, not the full changeset. That should keep stable
> folks much happier... :-) I'll soon put my reduced proposal to:
>   http://www.cs.helsinki.fi/u/ijjarvin/patches/stable-0001.patch
> The other patch (DSACK) can go to stable as is.

I placed those two earlier sent bidir fixes and these two additional fixes 
on top of 2.6.22 and was finally able to have them tested on a bootable 
kernel (I had a boot failure on another machine too with 2.6.23-rc1 
stuff). FACK&NewReno/bidir and FACK/unidir tested, time-seq graphs were 
ok.

Dave, please put these two patches to net-2.6 to complete bidir fix 
series. ...And please push to stable as well, take just the minimized 
"fix" portion of this "[TCP]: Also handle snd_una changes in 
tcp_cwnd_down" patch as I described above. Other cleanups in it can be
put just to net-2.6.

-- 
 i.