From: David Miller <davem@davemloft.net>
To: tph@fb.com
Cc: netdev@vger.kernel.org, jonathan.lemon@gmail.com, dsj@fb.com,
edumazet@google.com, ncardwell@google.com, dave.taht@gmail.com,
ycheng@google.com, soheil@google.com
Subject: Re: [PATCH v5 2/2] tcp: Add snd_wnd to TCP_INFO
Date: Mon, 16 Sep 2019 16:39:55 +0200 (CEST) [thread overview]
Message-ID: <20190916.163955.2206355736506010205.davem@davemloft.net> (raw)
In-Reply-To: <20190913232332.44036-2-tph@fb.com>
From: Thomas Higdon <tph@fb.com>
Date: Fri, 13 Sep 2019 23:23:35 +0000
> Neal Cardwell mentioned that snd_wnd would be useful for diagnosing TCP
> performance problems --
>> (1) Usually when we're diagnosing TCP performance problems, we do so
>> from the sender, since the sender makes most of the
>> performance-critical decisions (cwnd, pacing, TSO size, TSQ, etc).
>> From the sender-side the thing that would be most useful is to see
>> tp->snd_wnd, the receive window that the receiver has advertised to
>> the sender.
>
> This serves the purpose of adding an additional __u32 to avoid the
> would-be hole caused by the addition of the tcpi_rcvi_ooopack field.
>
> Signed-off-by: Thomas Higdon <tph@fb.com>
Applied.
next prev parent reply other threads:[~2019-09-16 14:40 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-13 23:23 [PATCH v5 1/2] tcp: Add TCP_INFO counter for packets received out-of-order Thomas Higdon
2019-09-13 23:23 ` [PATCH v5 2/2] tcp: Add snd_wnd to TCP_INFO Thomas Higdon
2019-09-13 23:36 ` Yuchung Cheng
2019-09-14 15:45 ` Neal Cardwell
2019-09-14 17:57 ` Soheil Hassas Yeganeh
2019-09-16 14:39 ` David Miller [this message]
2019-09-14 15:43 ` [PATCH v5 1/2] tcp: Add TCP_INFO counter for packets received out-of-order Neal Cardwell
2019-09-16 17:42 ` Thomas Higdon
2019-09-16 14:39 ` David Miller
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=20190916.163955.2206355736506010205.davem@davemloft.net \
--to=davem@davemloft.net \
--cc=dave.taht@gmail.com \
--cc=dsj@fb.com \
--cc=edumazet@google.com \
--cc=jonathan.lemon@gmail.com \
--cc=ncardwell@google.com \
--cc=netdev@vger.kernel.org \
--cc=soheil@google.com \
--cc=tph@fb.com \
--cc=ycheng@google.com \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
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).