netdev - Re: all syscalls initially taking 4usec on a P4? Re: nonblocking UDPv4 recvfrom() taking 4usec @ 3GHz?

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Message-Id: <1172010148.3531.158.camel@laptopd505.fenrus.org>
Date:	Tue, 20 Feb 2007 23:22:27 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	bert hubert <bert.hubert@...herlabs.nl>
Cc:	Rick Jones <rick.jones2@...com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Josef Sipek <jsipek@....cs.sunysb.edu>,
	Andi Kleen <andi@...stfloor.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: all syscalls initially taking 4usec on a P4? Re: nonblocking 
	UDPv4 recvfrom() taking 4usec @ 3GHz?


> I'm trying to figure out which processes have the most impact, I had already
> killed anything non-essential. But that still leaves 140 pids.

btw if you have systemtap on your system you can see who is doing evil
with

http://www.fenrus.org/cstop.stp

also.. running "vmstat 3" and looking at the "cs" column is interesting;
it shouldn't be above 50 or so in idle (well not above 10 but our
userland stinks too much for that)


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