Date: Tue, 2 Jan 2018 19:21:24 +0100
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Neal Cardwell <ncardwell@google.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>, linux@roeck-us.net,
        shuahkh@osg.samsung.com, patches@kernelci.org,
        ben.hutchings@codethink.co.uk, lkft-triage@lists.linaro.org,
        stable@vger.kernel.org, David Miller <davem@davemloft.net>,
        Yuchung Cheng <ycheng@google.com>,
        Soheil Hassas Yeganeh <soheil@google.com>,
        Eric Dumazet <edumazet@google.com>
Subject: Re: [PATCH 4.9 00/75] 4.9.74-stable review
Message-ID: <20180102182124.GB30379@kroah.com>
References: <20180101140056.475827799@linuxfoundation.org>
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On Tue, Jan 02, 2018 at 11:57:59AM -0500, Neal Cardwell wrote:
> On Mon, Jan 1, 2018 at 9:31 AM, Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
> > This is the start of the stable review cycle for the 4.9.74 release.
> > There are 75 patches in this series, all will be posted as a response
> > to this one.  If anyone has any issues with these being applied, please
> > let me know.
> >
> > Responses should be made by Wed Jan  3 14:00:03 UTC 2018.
> > Anything received after that time might be too late.
> >
> > The whole patch series can be found in one patch at:
> >         kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.9.74-rc1.gz
> > or in the git tree and branch at:
> >   git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.9.y
> > and the diffstat can be found below.
> 
> Hi Greg,
> 
> In looking at the 4.9 and 4.14 patches yesterday, I noticed there were
> two TCP BBR fixes that made it into 4.14 but not 4.9. Doing an
> inventory of the TCP BBR fixes, AFAICT we have:
> 
> c589e69b508d tcp_bbr: record "full bw reached" decision in new
> full_bw_reached bit
>  - in 4.9 and 4.14 (great)
> 
> 2f6c498e4f15 tcp_bbr: reset full pipe detection on loss recovery undo
>   - in 4.14 (but not 4.9)
> 
> 600647d467c6 tcp_bbr: reset long-term bandwidth sampling on loss recovery undo
>   - in 4.14 (but not 4.9)
> 
> Lacking the second and third patches in 4.9 will not cause any new
> problems, but it will miss out on some nice fixes. If it's possible to
> get  2f6c498e4f15 and 600647d467c6 either into 4.9.74 or 4.9.75, I
> would be very grateful.

I go with the set of backported patches from DaveM, so I just assume he
didn't include these in the 4.9 set of patches for a good reason.

You can ask on netdev@ about this and cc: me, to make it go a bit
faster, if I get an ACK from DaveM, I can queue them up directly.

thanks,

greg k-h