Discussion of explicit congestion notification's impact on the Internet
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From: Jeremy Harris <jgh@wizmail.org>
To: ecn-sane@lists.bufferbloat.net
Subject: Re: [Ecn-sane] rfc3168 sec 6.1.2
Date: Thu, 29 Aug 2019 15:35:55 +0100	[thread overview]
Message-ID: <ad96e0ad-c547-d737-378f-77436416ce05@wizmail.org> (raw)
In-Reply-To: <CAA93jw5G2fONfM6zfkdkugOUwUXLbk5aBtr8ii9XYQ8Mqs42Uw@mail.gmail.com>

On 29/08/2019 14:51, Dave Taht wrote:
> On Thu, Aug 29, 2019 at 1:02 AM Jonathan Morton <chromatix99@gmail.com> wrote:
>>
>>> On 29 Aug, 2019, at 5:08 am, Dave Taht <dave.taht@gmail.com> wrote:
>>>
>>> It would explain a lot if this was not actually implemented in Linux.
>>> I'm afraid to look. cwnd reduction is capped to 2. 1 should put you
>>> in quickack mode AND to go lower seemingly it's supposed to
>>> then rely on the retransmit timer.
>>
>> Nowadays the same effect can be obtained from the pacing timer.  Just set the CA scale factor to 50% to get an effective minimum cwnd of 1, or lower still if needed.
> 
> But that wouldn't trigger quickacks from the other side unless it's cwnd 1?

I've also seen suggestion of reducing the effective MSS for the
duration of really-low-cwnd.  Any comments on that?

-- 
Cheers,
  Jeremy

  reply	other threads:[~2019-08-29 14:35 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-29  2:08 Dave Taht
2019-08-29  8:02 ` Jonathan Morton
2019-08-29 13:51   ` Dave Taht
2019-08-29 14:35     ` Jeremy Harris [this message]
2019-08-29 14:42     ` Jonathan Morton
2019-08-29 19:10       ` Dave Taht
2019-08-29 19:45         ` Dave Taht

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