From: Nicolas Cavallari <Nicolas.Cavallari@lri.fr>
To: Eric Dumazet <eric.dumazet@gmail.com>,
Michal Kazior <michal.kazior@tieto.com>
Cc: Neal Cardwell <ncardwell@google.com>,
linux-wireless <linux-wireless@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>,
eyalpe@dev.mellanox.co.il
Subject: Re: Throughput regression with `tcp: refine TSO autosizing`
Date: Fri, 06 Feb 2015 10:39:34 +0100 [thread overview]
Message-ID: <54D48BD6.2060202@lri.fr> (raw)
In-Reply-To: <1423147722.31870.65.camel@edumazet-glaptop2.roam.corp.google.com>
On 05/02/2015 15:48, Eric Dumazet wrote:
> On Thu, 2015-02-05 at 14:44 +0100, Michal Kazior wrote:
>
>> I do get your point. But 1.5ms is really tough on Wi-Fi.
>>
>> Just look at this:
>>
>> ; ping 192.168.1.2 -c 3
>> PING 192.168.1.2 (192.168.1.2) 56(84) bytes of data.
>> 64 bytes from 192.168.1.2: icmp_seq=1 ttl=64 time=1.83 ms
>> 64 bytes from 192.168.1.2: icmp_seq=2 ttl=64 time=2.02 ms
>> 64 bytes from 192.168.1.2: icmp_seq=3 ttl=64 time=1.98 ms
>
> Thats a different point.
>
> I dont care about rtt but TX completions. (usually much much lower than
> rtt)
On wired network perhaps, but definitely not on Wi-Fi.
With aggregation, you may send up to 4ms of data before the receiver
can acknowledge anything. But you have to gain access to the channel
first, so you may wait while others finish off their 4ms
transmissions. And this does not account for retransmissions.
And aggregation is not the only problem as far as bufferbloat is
concerned. I don't even want to think about powersave.
next prev parent reply other threads:[~2015-02-06 9:39 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-29 11:48 Throughput regression with `tcp: refine TSO autosizing` Michal Kazior
2015-01-29 13:14 ` Eric Dumazet
2015-01-30 10:29 ` Arend van Spriel
2015-01-30 13:19 ` Eric Dumazet
2015-01-30 13:47 ` Arend van Spriel
2015-01-30 14:37 ` Eric Dumazet
[not found] ` <CAA93jw5fqhz0Hiw74L2GXgtZ9JsMg+NtYydKxKzGDrvQcZn4hA@mail.gmail.com>
[not found] ` <CAA93jw7b0E9jjQYXrEPzjLLC9j8xNC0TFYXpWVtgFameJaNBdw@mail.gmail.com>
[not found] ` <1422741065.199624134@apps.rackspace.com>
[not found] ` <CAPp0ZBb2nkA6Y0s=W0kw=zvyn0wi0NMBRsBCw_xcD61ScOmgQg@mail.gmail.com>
[not found] ` <CAA_e5Z46Bu+zZZFzf_ejzA35Gw3g1_OG85yv6yd7MpbwZcE-nw@mail.gmail.com>
[not found] ` <CAA93jw7=oTex0Mp-0ThvuDRUnfR0N8tzdOQ8DD7QYWphp1b=4w@mail.gmail.com>
[not found] ` <CAJq5cE3ETbpEtecFHmhgHQveNRUhVfrzjTOygHm-TRCTwHNyKA@mail.gmail.com>
[not found] ` <1422801814.796219699@apps.rackspace.com>
[not found] ` <CAA_e5Z5PfimZeC5cqSk_xFpKOBeZ74htLeEdwtKieAYWJaEX+A@mail.gmail.com>
2015-02-02 4:04 ` [Cerowrt-devel] Fwd: " Avery Pennarun
2015-02-02 15:25 ` Jim Gettys
2015-02-02 4:21 ` Avery Pennarun
2015-02-02 7:07 ` David Lang
2015-01-30 13:39 ` Michal Kazior
2015-01-30 14:40 ` Eric Dumazet
2015-02-02 10:27 ` Michal Kazior
2015-02-02 18:52 ` Eric Dumazet
2015-02-02 21:25 ` Ben Greear
2015-02-02 23:06 ` Eric Dumazet
2015-02-03 9:00 ` Michal Kazior
2015-02-03 1:18 ` Eric Dumazet
2015-02-03 11:50 ` Michal Kazior
2015-02-03 14:27 ` Eric Dumazet
2015-02-03 15:03 ` Eric Dumazet
2015-02-04 11:35 ` Michal Kazior
2015-02-04 11:57 ` Eric Dumazet
2015-02-04 12:22 ` Michal Kazior
2015-02-04 12:38 ` Eric Dumazet
2015-02-04 12:53 ` Michal Kazior
2015-02-04 12:55 ` Johannes Berg
2015-02-04 13:16 ` Eric Dumazet
2015-02-04 13:29 ` Eric Dumazet
2015-02-04 21:11 ` Eric Dumazet
2015-02-05 6:46 ` Michal Kazior
2015-02-05 13:03 ` Eric Dumazet
2015-02-05 8:38 ` Michal Kazior
2015-02-05 12:57 ` Eric Dumazet
2015-02-05 13:19 ` Eric Dumazet
2015-02-05 13:33 ` Eric Dumazet
2015-02-05 13:44 ` Michal Kazior
2015-02-05 14:41 ` Eric Dumazet
2015-02-05 17:10 ` Eric Dumazet
2015-02-06 9:42 ` Michal Kazior
2015-02-06 13:40 ` Eric Dumazet
2015-02-06 13:53 ` Eric Dumazet
2015-02-06 14:09 ` Michal Kazior
2015-02-09 13:47 ` Michal Kazior
2015-02-09 15:11 ` Eric Dumazet
2015-02-10 10:33 ` Michal Kazior
2015-02-10 12:54 ` Eric Dumazet
2015-02-10 13:05 ` Eric Dumazet
2015-02-10 13:14 ` Eric Dumazet
2015-02-11 8:33 ` Michal Kazior
2015-02-11 13:17 ` Eric Dumazet
2015-02-12 7:16 ` Michal Kazior
2015-02-10 14:19 ` Johannes Berg
2015-02-10 15:09 ` Eric Dumazet
2015-02-11 8:57 ` Michal Kazior
2015-02-12 7:48 ` Michal Kazior
2015-02-12 8:33 ` Dave Taht
2015-02-24 10:24 ` Johannes Berg
2015-02-24 10:30 ` Johannes Berg
2015-02-24 10:59 ` Johannes Berg
2015-03-31 11:08 ` Johannes Berg
2015-02-06 14:10 ` Eric Dumazet
2015-02-06 14:31 ` David Laight
2015-02-06 15:02 ` Eric Dumazet
2015-02-06 14:08 ` Michal Kazior
2015-02-06 14:35 ` Eric Dumazet
2015-02-06 17:48 ` Rick Jones
2015-02-05 14:48 ` Eric Dumazet
2015-02-06 9:39 ` Nicolas Cavallari [this message]
2015-02-05 19:50 ` Dave Taht
2015-02-06 9:57 ` Michal Kazior
2015-02-03 8:44 ` Michal Kazior
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=54D48BD6.2060202@lri.fr \
--to=nicolas.cavallari@lri.fr \
--cc=eric.dumazet@gmail.com \
--cc=eyalpe@dev.mellanox.co.il \
--cc=linux-wireless@vger.kernel.org \
--cc=michal.kazior@tieto.com \
--cc=ncardwell@google.com \
--cc=netdev@vger.kernel.org \
/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).