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List:       user-mode-linux-user
Subject:    Re: [uml-user] uml and "system" load
From:       Adam Heath <adam () lapdoog ! doogie ! org>
Date:       2002-11-24 9:45:04
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On Sun, 24 Nov 2002, Nuno Silva wrote:

> When, inside UML, I do a "seq 1 1000000 > /dev/null" the system (as
> opposed to user or total) load in the host goes up 1 or 2%, but when I
> do a "ping -c 10000 -f 127.0.0.1" the system load, on the host, goes up
> 40-50%.

seq doesn't do much in kernel space.  just the occasional output on stdout,
after being fed thru a buffer.

ping does a lot of network calls.  This requires more round trips into the
host, and therefor increase it much more.

Any app that does heavy network i/o will suffer under uml, as they have high
overhead.



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