From: Eric Dumazet <eric.dumazet@gmail.com>
To: Rick Jones <rick.jones2@hp.com>
Cc: David Miller <davem@davemloft.net>,
subramanian.vijay@gmail.com, netdev@vger.kernel.org
Subject: Re: [RFC] tcp: use order-3 pages in tcp_sendmsg()
Date: Fri, 21 Sep 2012 17:48:31 +0200 [thread overview]
Message-ID: <1348242511.2669.635.camel@edumazet-glaptop> (raw)
In-Reply-To: <1348172722.2669.10.camel@edumazet-glaptop>
On Thu, 2012-09-20 at 22:25 +0200, Eric Dumazet wrote:
> On Thu, 2012-09-20 at 13:06 -0700, Rick Jones wrote:
>
> >
> > 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.
>
> Sending perfect packets (large packets) should trigger no retransmits.
By the way, with current MTU of 16436 on loopback, max packet size is
48KB (3 MSS)
Using an mtu of 65536 allows another 25% increase of bulk performance...
(and less potential reordering effects, as a packet contains one MSS
instead of three)
There is probably a reason why lo default MTU is 16436 ?
next prev parent reply other threads:[~2012-09-21 15:48 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
2012-09-20 20:25 ` Eric Dumazet
2012-09-21 15:48 ` Eric Dumazet [this message]
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=1348242511.2669.635.camel@edumazet-glaptop \
--to=eric.dumazet@gmail.com \
--cc=davem@davemloft.net \
--cc=netdev@vger.kernel.org \
--cc=rick.jones2@hp.com \
--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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox