From: Michael Richardson <Michael.Richardson@seawaynetworks.com>
To: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] Q: UML thread communication - scheduling oddness
Date: Thu, 05 Aug 2004 09:31:35 -0400 [thread overview]
Message-ID: <2423.1091712695@camelot-054> (raw)
In-Reply-To: <200408050020.i750Kwvv009127@ccure.user-mode-linux.org>
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>>>>> "Jeff" == Jeff Dike <jdike@addtoit.com> writes:
Jeff> gmarzot@nortelnetworks.com said:
>> That is, if I run a little busy loop /mnt/plankton/stress --cpu 1
>> --io 1 on the server side, the round trip time for messages is
>> greatly *improved*. without this activity and a basically dormant
>> server side UML the round trip times show considerable variabilty
>> with gaps on the order of seconds.
Jeff> How's this for a theory: The server's host is short on memory.
Jeff> A UML which is answering pings every second or so can be
The theory is sound to me.
The host doesn't have to be short on memory for this to happen either.
It suffices for there to be things that are groverling through the
file systems, and pulling in disk pages for processes to get swapped
out.
- --
] ON HUMILITY: to err is human. To moo, bovine. [
] Michael Richardson, Seaway Networks Corporation [
] michael@seawaynetworks.com http://www.seawaynetworks.com/ [
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [
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next prev parent reply other threads:[~2004-08-05 13:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-04 20:10 [uml-devel] Q: UML thread communication - scheduling oddness Joe Marzot
2004-08-05 0:20 ` Jeff Dike
2004-08-05 13:31 ` Michael Richardson [this message]
2004-08-05 13:35 ` Joe Marzot
2004-08-05 17:23 ` Jeff Dike
2004-08-05 16:45 ` Joe Marzot
2004-08-05 19:17 ` Jeff Dike
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