From: Jesper Dangaard Brouer <jdb@comx.dk>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: netdev <netdev@vger.kernel.org>
Subject: Re: Loopback performance from kernel 2.6.12 to 2.6.37
Date: Tue, 09 Nov 2010 14:59:19 +0100 [thread overview]
Message-ID: <1289311159.17448.9.camel@traveldev.cxnet.dk> (raw)
In-Reply-To: <1289228785.2820.203.camel@edumazet-laptop>
On Mon, 2010-11-08 at 16:06 +0100, Eric Dumazet wrote:
...
> > > > > I noticed that the loopback performance has gotten quite bad:
> > > > >
> > > > > http://www.phoronix.com/scan.php?page=article&item=linux_2612_2637&num=6
> >
> CC netdev, if you dont mind.
No problem :-)
> Their network test is basically :
>
> netcat -l 9999 >/dev/null &
> time dd if=/dev/zero bs=1M count=10000 | netcat 127.0.0.1 9999
Should it not be:
netcat -l -p 9999 >/dev/null &
When I run the commands "dd | netcat", netcat never finish/exits, I have
to press Ctrl-C to stop it. What am I doing wrong? Any tricks?
"dd" reports 17.54 sec, and but the "time" measurement cannot be uses as
the netcat just hangs/waits for more data...
time dd if=/dev/zero bs=1M count=10000 | netcat 127.0.0.1 9999
10000+0 records in
10000+0 records out
10485760000 bytes (10 GB) copied, 17,5419 s, 598 MB/s
When I run the commands, I see 261682 context switches per sec...
This quick test were on a Core i7 920 using kernel
2.6.32-rc3-net-next-dev-mp2t.
--
Jesper Dangaard Brouer
ComX Networks A/S
next prev parent reply other threads:[~2010-11-09 14:07 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1288954189.28003.178.camel@firesoul.comx.local>
[not found] ` <1288988955.2665.297.camel@edumazet-laptop>
[not found] ` <1289213926.15004.19.camel@firesoul.comx.local>
[not found] ` <1289214289.2820.188.camel@edumazet-laptop>
2010-11-08 15:06 ` Loopback performance from kernel 2.6.12 to 2.6.37 Eric Dumazet
2010-11-09 0:05 ` Andrew Hendry
2010-11-09 5:22 ` Eric Dumazet
2010-11-09 6:23 ` Eric Dumazet
2010-11-09 6:30 ` Andrew Hendry
2010-11-09 6:38 ` Eric Dumazet
2010-11-09 6:42 ` Eric Dumazet
2010-11-09 13:59 ` Jesper Dangaard Brouer [this message]
2010-11-09 14:06 ` Eric Dumazet
2010-11-09 14:16 ` Jesper Dangaard Brouer
2010-11-09 14:25 ` Eric Dumazet
2010-11-18 13:52 ` Eric Dumazet
2010-11-18 17:41 ` Eric Dumazet
2010-11-18 17:48 ` David Miller
2010-11-09 14:38 ` Jesper Dangaard Brouer
2010-11-10 11:24 ` Jesper Dangaard Brouer
2010-12-12 15:48 ` Arnaldo Carvalho de Melo
2010-11-09 21:35 Xose Vazquez Perez
2010-11-10 8:49 ` Jesper Dangaard Brouer
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