From: Eric Dumazet <eric.dumazet@gmail.com>
To: Willy Tarreau <w@1wt.eu>
Cc: Arnaud Ebalard <arno@natisbad.org>,
Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
Florian Fainelli <f.fainelli@gmail.com>,
simon.guinot@sequanux.org, netdev@vger.kernel.org,
edumazet@google.com, Cong Wang <xiyou.wangcong@gmail.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s
Date: Tue, 19 Nov 2013 16:43:48 -0800 [thread overview]
Message-ID: <1384908228.8604.136.camel@edumazet-glaptop2.roam.corp.google.com> (raw)
In-Reply-To: <20131120003519.GA22150@1wt.eu>
On Wed, 2013-11-20 at 01:35 +0100, Willy Tarreau wrote:
> On Tue, Nov 19, 2013 at 04:08:49PM -0800, Eric Dumazet wrote:
> > On Wed, 2013-11-20 at 00:53 +0100, Arnaud Ebalard wrote:
> >
> > > Anyway, I think if the thread keeps going on improving mvneta, I'll do
> > > all additional tests from RAM and will stop polluting netdev w/ possible
> > > sata/disk/fs issues.
> >
> > ;)
> >
> > Alternative would be to use netperf or iperf to not use disk at all
> > and focus on TCP/network issues only.
>
> Yes, that's for the same reason that I continue to use inject/httpterm
> for such purposes :
> - httpterm uses tee()+splice() to send pre-built pages without copying ;
> - inject uses recv(MSG_TRUNC) to ack everything without copying.
>
> Both of them are really interesting to test the hardware's capabilities
> and to push components in the middle to their limits without causing too
> much burden to the end points.
>
> I don't know if either netperf or iperf can make use of this now, and
> I've been used to my tools, but I should take a look again.
netperf -t TCP_SENDFILE does the zero copy at sender.
And more generally -V option does copy avoidance
(Use splice(sockfd -> nullfd) at receiver if I remember well)
Anyway, we should do the normal copy, because it might demonstrate
scheduling problems.
If you want to test raw speed, you could use pktgen ;)
WARNING: multiple messages have this Message-ID (diff)
From: eric.dumazet@gmail.com (Eric Dumazet)
To: linux-arm-kernel@lists.infradead.org
Subject: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s
Date: Tue, 19 Nov 2013 16:43:48 -0800 [thread overview]
Message-ID: <1384908228.8604.136.camel@edumazet-glaptop2.roam.corp.google.com> (raw)
In-Reply-To: <20131120003519.GA22150@1wt.eu>
On Wed, 2013-11-20 at 01:35 +0100, Willy Tarreau wrote:
> On Tue, Nov 19, 2013 at 04:08:49PM -0800, Eric Dumazet wrote:
> > On Wed, 2013-11-20 at 00:53 +0100, Arnaud Ebalard wrote:
> >
> > > Anyway, I think if the thread keeps going on improving mvneta, I'll do
> > > all additional tests from RAM and will stop polluting netdev w/ possible
> > > sata/disk/fs issues.
> >
> > ;)
> >
> > Alternative would be to use netperf or iperf to not use disk at all
> > and focus on TCP/network issues only.
>
> Yes, that's for the same reason that I continue to use inject/httpterm
> for such purposes :
> - httpterm uses tee()+splice() to send pre-built pages without copying ;
> - inject uses recv(MSG_TRUNC) to ack everything without copying.
>
> Both of them are really interesting to test the hardware's capabilities
> and to push components in the middle to their limits without causing too
> much burden to the end points.
>
> I don't know if either netperf or iperf can make use of this now, and
> I've been used to my tools, but I should take a look again.
netperf -t TCP_SENDFILE does the zero copy at sender.
And more generally -V option does copy avoidance
(Use splice(sockfd -> nullfd) at receiver if I remember well)
Anyway, we should do the normal copy, because it might demonstrate
scheduling problems.
If you want to test raw speed, you could use pktgen ;)
next prev parent reply other threads:[~2013-11-20 0:43 UTC|newest]
Thread overview: 121+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-10 13:53 [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s Arnaud Ebalard
2013-11-10 13:53 ` Arnaud Ebalard
2013-11-12 6:48 ` Cong Wang
2013-11-12 6:48 ` Cong Wang
2013-11-12 7:56 ` Arnaud Ebalard
2013-11-12 7:56 ` Arnaud Ebalard
2013-11-12 8:36 ` Willy Tarreau
2013-11-12 8:36 ` Willy Tarreau
2013-11-12 9:14 ` Arnaud Ebalard
2013-11-12 9:14 ` Arnaud Ebalard
2013-11-12 10:01 ` Willy Tarreau
2013-11-12 10:01 ` Willy Tarreau
2013-11-12 15:34 ` Arnaud Ebalard
2013-11-12 15:34 ` Arnaud Ebalard
2013-11-13 7:22 ` Willy Tarreau
2013-11-13 7:22 ` Willy Tarreau
2013-11-17 14:19 ` Willy Tarreau
2013-11-17 14:19 ` Willy Tarreau
2013-11-17 17:41 ` Eric Dumazet
2013-11-17 17:41 ` Eric Dumazet
2013-11-19 6:44 ` Arnaud Ebalard
2013-11-19 6:44 ` Arnaud Ebalard
2013-11-19 13:53 ` Eric Dumazet
2013-11-19 13:53 ` Eric Dumazet
2013-11-19 17:43 ` Willy Tarreau
2013-11-19 17:43 ` Willy Tarreau
2013-11-19 18:31 ` Eric Dumazet
2013-11-19 18:31 ` Eric Dumazet
2013-11-19 18:41 ` Willy Tarreau
2013-11-19 18:41 ` Willy Tarreau
2013-11-19 23:53 ` Arnaud Ebalard
2013-11-19 23:53 ` Arnaud Ebalard
2013-11-20 0:08 ` Eric Dumazet
2013-11-20 0:08 ` Eric Dumazet
2013-11-20 0:35 ` Willy Tarreau
2013-11-20 0:35 ` Willy Tarreau
2013-11-20 0:43 ` Eric Dumazet [this message]
2013-11-20 0:43 ` Eric Dumazet
2013-11-20 0:52 ` Willy Tarreau
2013-11-20 0:52 ` Willy Tarreau
2013-11-20 8:50 ` Thomas Petazzoni
2013-11-20 8:50 ` Thomas Petazzoni
2013-11-20 19:21 ` Arnaud Ebalard
2013-11-20 19:11 ` Willy Tarreau
2013-11-20 19:11 ` Willy Tarreau
2013-11-20 19:26 ` Arnaud Ebalard
2013-11-20 19:26 ` Arnaud Ebalard
2013-11-20 21:28 ` Arnaud Ebalard
2013-11-20 21:28 ` Arnaud Ebalard
2013-11-20 21:54 ` Willy Tarreau
2013-11-20 21:54 ` Willy Tarreau
2013-11-21 0:44 ` Willy Tarreau
2013-11-21 0:44 ` Willy Tarreau
2013-11-21 18:38 ` ARM network performance and dma_mask (was: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s) Willy Tarreau
2013-11-21 19:04 ` Thomas Petazzoni
2013-11-21 19:04 ` Thomas Petazzoni
2013-11-21 21:51 ` Willy Tarreau
2013-11-21 21:51 ` ARM network performance and dma_mask (was: [BUG, REGRESSION?] 3.11.6+, 3.12: " Willy Tarreau
2013-11-21 22:01 ` ARM network performance and dma_mask Rob Herring
2013-11-21 22:01 ` Rob Herring
2013-11-21 22:13 ` Willy Tarreau
2013-11-21 22:13 ` Willy Tarreau
2013-11-21 21:51 ` [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s Arnaud Ebalard
2013-11-21 21:51 ` Arnaud Ebalard
2013-11-21 21:52 ` Willy Tarreau
2013-11-21 21:52 ` Willy Tarreau
2013-11-21 22:00 ` Eric Dumazet
2013-11-21 22:00 ` Eric Dumazet
2013-11-21 22:55 ` Arnaud Ebalard
2013-11-21 22:55 ` Arnaud Ebalard
2013-11-21 23:23 ` Rick Jones
2013-11-21 23:23 ` Rick Jones
2013-11-20 17:12 ` Willy Tarreau
2013-11-20 17:12 ` Willy Tarreau
2013-11-20 17:30 ` Eric Dumazet
2013-11-20 17:30 ` Eric Dumazet
2013-11-20 17:38 ` Willy Tarreau
2013-11-20 17:38 ` Willy Tarreau
2013-11-20 18:52 ` David Miller
2013-11-20 18:52 ` David Miller
2013-11-20 17:34 ` Willy Tarreau
2013-11-20 17:34 ` Willy Tarreau
2013-11-20 17:40 ` Eric Dumazet
2013-11-20 17:40 ` Eric Dumazet
2013-11-20 18:15 ` Willy Tarreau
2013-11-20 18:15 ` Willy Tarreau
2013-11-20 18:21 ` Eric Dumazet
2013-11-20 18:21 ` Eric Dumazet
2013-11-20 18:29 ` Willy Tarreau
2013-11-20 18:29 ` Willy Tarreau
2013-11-20 19:22 ` Arnaud Ebalard
2013-11-20 19:22 ` Arnaud Ebalard
2013-11-18 10:09 ` David Laight
2013-11-18 10:09 ` David Laight
2013-11-18 10:52 ` Willy Tarreau
2013-11-18 10:52 ` Willy Tarreau
2013-11-18 10:26 ` Thomas Petazzoni
2013-11-18 10:26 ` Thomas Petazzoni
2013-11-18 10:44 ` Simon Guinot
2013-11-18 10:44 ` Simon Guinot
2013-11-18 16:54 ` Stephen Hemminger
2013-11-18 16:54 ` Stephen Hemminger
2013-11-18 17:13 ` Eric Dumazet
2013-11-18 17:13 ` Eric Dumazet
2013-11-18 10:51 ` Willy Tarreau
2013-11-18 10:51 ` Willy Tarreau
2013-11-18 17:58 ` Florian Fainelli
2013-11-18 17:58 ` Florian Fainelli
2013-11-12 14:39 ` [PATCH] tcp: tsq: restore minimal amount of queueing Eric Dumazet
2013-11-12 15:24 ` Sujith Manoharan
2013-11-13 14:06 ` Eric Dumazet
2013-11-13 14:32 ` [PATCH v2] " Eric Dumazet
2013-11-13 21:18 ` Arnaud Ebalard
2013-11-13 21:59 ` Holger Hoffstaette
2013-11-13 23:40 ` Eric Dumazet
2013-11-13 23:52 ` Holger Hoffstaette
2013-11-17 23:15 ` Francois Romieu
2013-11-18 16:26 ` Holger Hoffstätte
2013-11-18 16:47 ` Eric Dumazet
2013-11-13 22:41 ` Eric Dumazet
2013-11-14 21:26 ` David Miller
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