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List:       gentoo-user
Subject:    [gentoo-user] How to determine 'Least Common Denominator' between Xen(Server) Hosts
From:       Pandu Poluan <pandu () poluan ! info>
Date:       2013-08-14 5:18:41
Message-ID: CAA2qdGWp5UTho2KfRiNnBoPCFEUoZE126+4EMuw3EYFHuCP2wQ () mail ! gmail ! com
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Hello list!

My company has 2 HP DL585 G5 servers and 5 Dell R... something servers. All
using AMD processors. They currently are acting as XenServer hosts.

How do I determine the 'least common denominator' for Gentoo VMs (running
as XenServer guests), especially for gcc flags?

I know that the (theoretical) best performance is to use -march=native ,
but since the processors of the HP servers are not exactly the same as the
Dell's, I'm concerned that compiling with -march=native will render the VMs
unable to migrate between the different hosts.

Note: Yes I know the HP servers are much older than the Dell ones, but if I
go -march=native then perform an emerge when the guest is on the Dell host,
the guest VM might not be able to migrate to the older HPs.

Rgds,
--

[Attachment #3 (text/html)]

<p dir="ltr">Hello list!</p>
<p dir="ltr">My company has 2 HP DL585 G5 servers and 5 Dell R... something servers. \
All using AMD processors. They currently are acting as XenServer hosts.</p> <p \
dir="ltr">How do I determine the &#39;least common denominator&#39; for Gentoo VMs \
(running as XenServer guests), especially for gcc flags?</p> <p dir="ltr">I know that \
the (theoretical) best performance is to use -march=native , but since the processors \
of the HP servers are not exactly the same as the Dell&#39;s, I&#39;m concerned that \
compiling with -march=native will render the VMs unable to migrate between the \
different hosts.</p>

<p dir="ltr">Note: Yes I know the HP servers are much older than the Dell ones, but \
if I go -march=native then perform an emerge when the guest is on the Dell host, the \
guest VM might not be able to migrate to the older HPs.</p>

<p dir="ltr">Rgds,<br>
--<br>
</p>



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