From: Rick Jones <rick.jones2@hp.com>
To: David Miller <davem@davemloft.net>
Cc: eric.dumazet@gmail.com, subramanian.vijay@gmail.com,
netdev@vger.kernel.org
Subject: Re: [RFC] tcp: use order-3 pages in tcp_sendmsg()
Date: Thu, 20 Sep 2012 13:06:22 -0700 [thread overview]
Message-ID: <505B773E.9070501@hp.com> (raw)
In-Reply-To: <20120920.154007.1073423645697694793.davem@davemloft.net>
On 09/20/2012 12:40 PM, David Miller wrote:
> From: Rick Jones <rick.jones2@hp.com>
> Date: Thu, 20 Sep 2012 10:10:43 -0700
>
>> On 09/19/2012 10:37 PM, Eric Dumazet wrote:
>>> loopback is lossless, so its always surprising we can have TCP
>>> retransmits on this medium ;)
>>
>> Is it lossless?
>>
>> raj@tardy:~/netperf2_trunk$ netstat -s | grep pru
>> 19 packets pruned from receive queue because of socket buffer overrun
>
> Those packets are not being dropped by the loopback device.
>
Yes, I was being too fast and loose with my wording, paying more
attention to the netperf tests than the rest of it. While loopback may
be lossless, TCP retransmissions over loopback shouldn't be all *that*
surprising.
rick
next prev parent reply other threads:[~2012-09-20 20:06 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-17 7:49 [RFC] tcp: use order-3 pages in tcp_sendmsg() Eric Dumazet
2012-09-17 16:12 ` David Miller
2012-09-17 17:02 ` Eric Dumazet
2012-09-17 17:04 ` Eric Dumazet
2012-09-17 17:07 ` David Miller
2012-09-19 15:14 ` Eric Dumazet
2012-09-19 17:28 ` Rick Jones
2012-09-19 17:55 ` Eric Dumazet
2012-09-19 17:56 ` David Miller
2012-09-19 19:04 ` Alexander Duyck
2012-09-19 20:18 ` Ben Hutchings
2012-09-19 22:20 ` Vijay Subramanian
2012-09-20 5:37 ` Eric Dumazet
2012-09-20 17:10 ` Rick Jones
2012-09-20 17:43 ` Eric Dumazet
2012-09-20 18:37 ` Yuchung Cheng
2012-09-20 19:40 ` David Miller
2012-09-20 20:06 ` Rick Jones [this message]
2012-09-20 20:25 ` Eric Dumazet
2012-09-21 15:48 ` Eric Dumazet
2012-09-21 16:27 ` David Miller
2012-09-21 16:51 ` Eric Dumazet
2012-09-21 17:04 ` David Miller
2012-09-21 17:11 ` Eric Dumazet
2012-09-23 12:47 ` Jan Engelhardt
2012-09-23 16:16 ` David Miller
2012-09-23 17:40 ` Jan Engelhardt
2012-09-23 18:13 ` Eric Dumazet
2012-09-23 18:27 ` David Miller
2012-09-20 21:39 ` Vijay Subramanian
2012-09-20 22:01 ` Rick Jones
2012-11-15 7:52 ` Yan, Zheng
2012-11-15 13:06 ` Eric Dumazet
2012-11-16 2:36 ` Yan, Zheng
2012-11-15 13:47 ` Eric Dumazet
2012-11-21 8:05 ` Yan, Zheng
2012-11-15 18:33 ` Rick Jones
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=505B773E.9070501@hp.com \
--to=rick.jones2@hp.com \
--cc=davem@davemloft.net \
--cc=eric.dumazet@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=subramanian.vijay@gmail.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.