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From: Cong Wang <amwang@redhat.com>
To: Pravin B Shelar <pshelar@nicira.com>
Cc: netdev <netdev@vger.kernel.org>
Subject: A performance regression of gretap
Date: Wed, 10 Jul 2013 06:01:43 -0400 (EDT)	[thread overview]
Message-ID: <327738182.1491147.1373450503005.JavaMail.root@redhat.com> (raw)
In-Reply-To: <1025834928.1488534.1373450176613.JavaMail.root@redhat.com>

Hi, Pravin

I just noticed the performance over gretap is very bad,
which is probably caused by your GRE refactor patches.

See below:

# netperf -4 -H 192.168.2.1
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.2.1 () port 0 AF_INET
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384  16384    14.01       0.02   

Could you please take a look? And, gre tunnel is fine, this
problem only exists for gretap. I reviewed the gretap code,
but can't find any bug.

It is very easy to reproduce, just setup a gretap device
on both ends, and run netperf over it.

Thanks!

       reply	other threads:[~2013-07-10 10:01 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1025834928.1488534.1373450176613.JavaMail.root@redhat.com>
2013-07-10 10:01 ` Cong Wang [this message]
2013-07-10 15:18   ` A performance regression of gretap Rick Jones
2013-07-11  2:15   ` Cong Wang
2013-07-11  2:28     ` Pravin Shelar
2013-07-11  2:31       ` Cong Wang
2013-07-11  7:47         ` Pravin Shelar

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