From: Zoltan Kiss <zoltan.kiss@citrix•com>
To: Eric Dumazet <eric.dumazet@gmail•com>
Cc: Wei Liu <wei.liu2@citrix•com>,
Jonathan Davies <Jonathan.Davies@eu•citrix.com>,
Ian Campbell <ian.campbell@citrix•com>, <netdev@vger•kernel.org>,
<xen-devel@lists•xenproject.org>
Subject: Re: TSQ accounting skb->truesize degrades throughput for large packets
Date: Fri, 6 Sep 2013 17:36:42 +0100 [thread overview]
Message-ID: <522A049A.7000105@citrix.com> (raw)
In-Reply-To: <1378472268.31445.15.camel@edumazet-glaptop>
On 06/09/13 13:57, Eric Dumazet wrote:
> Well, I have no problem to get line rate on 20Gb with a single flow, so
> other drivers have no problem.
I've made some tests on bare metal:
Dell PE R815, Intel 82599EB 10Gb, 3.11-rc4 32 bit kernel with 3.17.3
ixgbe (TSO, GSO on), iperf 2.0.5
Transmitting packets toward the remote end (so running iperf -c on this
host) can make 8.3 Gbps with the default 128k tcp_limit_output_bytes.
When I increased this to 131.506 (128k + 434 bytes) suddenly it jumped
to 9.4 Gbps. Iperf CPU usage also jumped a few percent from ~36 to ~40%
(softint percentage in top also increased from ~3 to ~5%)
So I guess it would be good to revisit the default value of this
setting. What hw you used Eric for your 20Gb results?
Regards,
Zoli
next prev parent reply other threads:[~2013-09-06 16:36 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-06 10:16 TSQ accounting skb->truesize degrades throughput for large packets Wei Liu
2013-09-06 12:57 ` Eric Dumazet
2013-09-06 13:12 ` Wei Liu
2013-09-06 16:36 ` Zoltan Kiss [this message]
2013-09-06 16:56 ` Eric Dumazet
2013-09-09 9:27 ` Jason Wang
2013-09-09 13:47 ` Eric Dumazet
2013-09-10 7:45 ` Jason Wang
2013-09-10 12:35 ` Eric Dumazet
2013-09-06 17:00 ` Eric Dumazet
2013-09-07 17:21 ` Eric Dumazet
2013-09-09 21:41 ` Zoltan Kiss
2013-09-09 21:56 ` Eric Dumazet
[not found] ` <loom.20130921T045654-573@post.gmane.org>
[not found] ` <20130921150327.GA9078@zion.uk.xensource.com>
2013-09-22 2:36 ` [Xen-devel] " Cong Wang
2013-09-22 14:58 ` Eric Dumazet
2013-09-27 10:28 ` [PATCH] tcp: TSQ can use a dynamic limit Eric Dumazet
2013-09-27 15:08 ` Neal Cardwell
2013-09-29 15:41 ` Cong Wang
2013-10-01 3:52 ` David Miller
2013-09-09 5:28 ` TSQ accounting skb->truesize degrades throughput for large packets Cong Wang
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