From: Eric Dumazet <eric.dumazet@gmail.com>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: netdev@vger.kernel.org
Subject: Re: UDP regression with packets rates < 10k per sec
Date: Thu, 10 Sep 2009 22:37:56 +0200 [thread overview]
Message-ID: <4AA963A4.5080509@gmail.com> (raw)
In-Reply-To: <alpine.DEB.1.10.0909091350590.32067@V090114053VZO-1>
Something must be wrong with program or whatever...
On the receiver I did this to trace the latency messages only
# tcpdump -i eth0 not host 239.0.192.2 and port 9002 -n
22:28:07.223300 IP 55.225.18.7.9002 > 55.225.18.5.9002: UDP, length 32
22:28:07.223403 IP 55.225.18.5.9002 > 55.225.18.7.9002: UDP, length 32
22:28:08.223301 IP 55.225.18.7.9002 > 55.225.18.5.9002: UDP, length 32
22:28:08.223416 IP 55.225.18.5.9002 > 55.225.18.7.9002: UDP, length 32
22:28:09.223380 IP 55.225.18.7.9002 > 55.225.18.5.9002: UDP, length 32
22:28:09.223494 IP 55.225.18.5.9002 > 55.225.18.7.9002: UDP, length 32
22:28:10.223481 IP 55.225.18.7.9002 > 55.225.18.5.9002: UDP, length 32
22:28:10.223597 IP 55.225.18.5.9002 > 55.225.18.7.9002: UDP, length 32
22:28:11.223581 IP 55.225.18.7.9002 > 55.225.18.5.9002: UDP, length 32
22:28:11.223678 IP 55.225.18.5.9002 > 55.225.18.7.9002: UDP, length 32
See how the answer is *very* slow ? Something like > 100 us ?
next prev parent reply other threads:[~2009-09-10 20:37 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-08 22:38 UDP regression with packets rates < 10k per sec Christoph Lameter
2009-09-08 22:52 ` Eric Dumazet
2009-09-09 14:01 ` Christoph Lameter
2009-09-09 15:09 ` Eric Dumazet
2009-09-09 16:47 ` Christoph Lameter
2009-09-09 17:06 ` Eric Dumazet
2009-09-09 17:55 ` Christoph Lameter
2009-09-10 20:37 ` Eric Dumazet [this message]
2009-09-10 21:36 ` Christoph Lameter
2009-09-10 21:37 ` Eric Dumazet
2009-09-10 21:42 ` Christoph Lameter
2009-09-14 21:10 ` Christoph Lameter
2009-09-15 5:29 ` Eric Dumazet
2009-09-15 14:07 ` Christoph Lameter
2009-09-15 17:26 ` Eric Dumazet
2009-09-15 20:25 ` Christoph Lameter
2009-09-15 19:02 ` Eric Dumazet
2009-09-25 14:19 ` Eric Dumazet
2009-09-26 16:13 ` Christoph Lameter
2009-09-10 21:39 ` Christoph Lameter
2009-09-09 17:08 ` Eric Dumazet
2009-09-09 17:26 ` Christoph Lameter
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