From: Neal Cardwell <ncardwell@google.com>
To: Ben Greear <greearb@candelatech.com>
Cc: netdev <netdev@vger.kernel.org>, ath10k <ath10k@lists.infradead.org>
Subject: Re: Slow ramp-up for single-stream TCP throughput on 4.2 kernel.
Date: Sat, 3 Oct 2015 12:29:36 -0400 [thread overview]
Message-ID: <CADVnQym4U_dVVRdOVhORvVabwFjSHTQJ_LbbbYtzWVu0=mAp_A@mail.gmail.com> (raw)
In-Reply-To: <560F1F74.9010207@candelatech.com>
On Fri, Oct 2, 2015 at 8:21 PM, Ben Greear <greearb@candelatech.com> wrote:
> Gah, seems 'cubic' related. That is the default tcp cong ctrl
> I was using (same in 3.17, for that matter).
There have been recent changes to CUBIC that may account for this. If
you could repeat your test with more instrumentation, eg "nstat", that
would be very helpful.
nstat > /dev/null
# run one test
nstat
Also, if you could take a sender-side tcpdump trace of the test, that
would be very useful (default capture length, grabbing just headers,
is fine).
Thanks!
neal
next prev parent reply other threads:[~2015-10-03 16:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-02 23:42 Slow ramp-up for single-stream TCP throughput on 4.2 kernel Ben Greear
2015-10-03 0:21 ` Ben Greear
2015-10-03 16:29 ` Neal Cardwell [this message]
2015-10-03 22:46 ` Ben Greear
2015-10-04 1:20 ` Neal Cardwell
2015-10-04 17:05 ` Ben Greear
2015-10-04 17:28 ` Eric Dumazet
2015-10-04 19:33 ` Yuchung Cheng
2015-10-05 13:35 ` Ben Greear
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