netdev - fscked clock sources revisited

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Date:	Mon, 30 Jul 2007 21:10:39 -0400
From:	jamal <hadi@...erus.ca>
To:	netdev@...r.kernel.org
Cc:	David Miller <davem@...emloft.net>, Robert.Olsson@...a.slu.se,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: fscked clock sources revisited

Folks,

I have posted this before but got no good response and i havent had time
to chase it. 
While doing some batching tests with pktgen and then with a simple
client server app with udp, it does appear that the clock source used
matters. Here are some basic runs with plain vanilla 2.6.22-rc4 runs
with udp. There are five runs per clock source and each result is in
Mbps.

acpi_pm: 108, 110, 111,  91, 108
tsc:     143, 108, 161, 129, 108
jiffies: 132, 138, 132, 146, 150

jiffies produces better results than tsc which produces better results
than acpi_pm. 

Second issue: I cant consistently get two reboots to always boot with
the same clock source.

Any ideas whats going on here? I havent tried with latest tree.

PS:- These results are very easy to validate with iperf or netperf.

cheers,
jamal

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