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Re: [Xen-users] Dom0 vs native performance: does it look right?

If you look at the wikipedia page for xen it suggests that the performance cost of enabling vanilla tls is 50%.

It's worth trying the tls disabled configuration and seeing if this changes things



On Apr 12, 2009, at 6:51 PM, Ravikesh Chandra <rcha108@xxxxxxxxxxxxxxxxx> wrote:

Hi Stefan,

Thanks for your reply. However could you please elaborate further on
your statement?

I have the file
"/etc/ld.so.conf.d/kernelcap-2.6.18-128.1.6.el5xen.conf" which
contains "hwcap 0 nosegneg".. is that what you mean? I am running a
64-bit installation btw.

Thanks in advance.


2009/4/13 Stefan de Konink <stefan@xxxxxxxxx>:
Ravikesh Chandra wrote:

Hi folks,

Firstly I am running CentOS 5.3 with Xen 3.3.1 (gitco) and I've just
been testing the performance with the Unixbench test. What I found is that running the test on the Dom0 (under Xen kernel) resulted in only
50% performance of native! I appreciate there is always going to be
overheads with virtualisation but I just wanted to check with the list
if these numbers were expected? If that doesn't seem normal any
suggestions on what I could look at?

no tls cflag is a start.


Stefan

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