netdev - Re: Network latency regressions from 2.6.22 to 2.6.29

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Message-ID: <49E786FE.6090304@cosmosbay.com>
Date:	Thu, 16 Apr 2009 21:29:02 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	Rick Jones <rick.jones2@...com>, netdev@...r.kernel.org
Subject: Re: Network latency regressions from 2.6.22 to 2.6.29

Christoph Lameter a écrit :
> On Thu, 16 Apr 2009, Rick Jones wrote:
> 
>> Does udpping have a concept of service demand a la netperf?  That could help
>> show how much was code bloat vs say some tweak to interrupt coalescing
>> parameters in the NIC/driver.
> 
> No. What does service on demand mean? The ping pong tests are very simple
> back and forths without any streaming or overlay.
> --

Would be good to measure a ping flood, because this one doesnt
need wakeup of a user process on the remote side.


$ ping -f 192.168.20.112 -c 10000
PING 192.168.20.112 (192.168.20.112) 56(84) bytes of data.

--- 192.168.20.112 ping statistics ---
10000 packets transmitted, 10000 received, 0% packet loss, time 3337ms
rtt min/avg/max/mdev = 0.072/0.184/20.011/1.389 ms, pipe 2, ipg/ewma 0.333/0.078 ms

and check if various kernel versions already give you different values (for avg)

When you perform your test, you upgrade kernels of both machines ?

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