netdev - Re: Network latency regressions from 2.6.22 to 2.6.29

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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 ?

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html