From: Neal Cardwell <ncardwell@google.com>
To: Yuchung Cheng <ycheng@google.com>
Cc: David Miller <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Nandita Dukkipati <nanditad@google.com>,
Netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH 2/4 net-next] tcp: prefer packet timing to TS-ECR for RTT
Date: Sun, 21 Jul 2013 23:17:44 -0400 [thread overview]
Message-ID: <CADVnQyntukzrVuF9XfN-=hxT1c32tLcCHTQWzo2t6+0EzKxb5A@mail.gmail.com> (raw)
In-Reply-To: <1374385170-358-2-git-send-email-ycheng@google.com>
On Sun, Jul 21, 2013 at 1:39 AM, Yuchung Cheng <ycheng@google.com> wrote:
> Prefer packet timings to TS-ecr for RTT measurements when both
> sources are available. That's because broken middle-boxes and remote
> peer can return packets with corrupted TS ECR fields. Similarly most
> congestion controls that require RTT signals favor timing-based
> sources as well. Also check for bad TS ECR values to avoid RTT
> blow-ups. It has happened on production Web servers.
>
> Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
next prev parent reply other threads:[~2013-07-22 3:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-21 5:39 [PATCH 1/4 net-next] tcp: consolidate SYNACK RTT sampling Yuchung Cheng
2013-07-21 5:39 ` [PATCH 2/4 net-next] tcp: prefer packet timing to TS-ECR for RTT Yuchung Cheng
2013-07-22 3:17 ` Neal Cardwell [this message]
2013-07-21 5:39 ` [PATCH 3/4 net-next] tcp: measure RTT from new SACK Yuchung Cheng
2013-07-22 3:32 ` Neal Cardwell
2013-07-21 5:39 ` [PATCH 4/4 net-next] tcp: use RTT from SACK for RTO Yuchung Cheng
2013-07-22 3:40 ` Neal Cardwell
2013-07-22 2:45 ` [PATCH 1/4 net-next] tcp: consolidate SYNACK RTT sampling Neal Cardwell
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CADVnQyntukzrVuF9XfN-=hxT1c32tLcCHTQWzo2t6+0EzKxb5A@mail.gmail.com' \
--to=ncardwell@google.com \
--cc=davem@davemloft.net \
--cc=edumazet@google.com \
--cc=nanditad@google.com \
--cc=netdev@vger.kernel.org \
--cc=ycheng@google.com \
--subject='Re: [PATCH 2/4 net-next] tcp: prefer packet timing to TS-ECR for RTT' \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).