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RE: [Xen-users] Improve performance of domain U

To: "'saptarshi naha'" <naha80@xxxxxxxxx>
Subject: RE: [Xen-users] Improve performance of domain U
From: "Steffen Heil" <lists@xxxxxxxxxxxxxxx>
Date: Sun, 3 Sep 2006 15:51:11 +0200
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> > > 2. Domain U have no /boot sector in /etc/fstab. It is all 
> a single 
> > > partition in / . I wanted to know if there are any shortcoming to 
> > > just having / partition to performance?
> >
> > I am also unsure about that point.
> I am not SURE  but maybe it is to prevent boot sector from 
> being corrupted.  But then that has NO connection to performance.

No, there isn't such a thing as a boot sector related to /boot. /boot is
sometimes taken as a distinct partition to make sure, it stays intact, even
if the filesystem of another partition is broken and therefor keeping the
system "somewhat" bootable. You usually have your kernels there...

However, that will not have any affect on performance. My "I am unsure" was
about having multiple partitions. A lot of people seem to say, that it has
advantages to use /var on a own partition for example, but I didn't try

> I will create the swap using LVM and GNBD and then pass the 
> swap partition using /dev/sda2 through configuration files. 
> Correct me if am wrong.

If you need to make sure, you can live-swap you domU to another host, you
need to do that.
However, if you use GNBD for live mirror as backup purpose, you should not
put swap there. Swap needs really fast access and network-backed devices
tend not to be so fast...

> Not SURE, Can giving the MAC and IP address in the Xen 
> configuration file make any difference to internal networking 
> performance?

No. It doesn't matter how you configure the virtual nic. But it surely makes
a difference wether you use the virtual nic with a linux bride or a real pci
nic (over pci passthrough).

> Is it possible to do windows installation on Xen with Xeon 
> processors but without dual core? I search on the intel site 
> and xensource but there is no mention for JUST xeon processor 
> have intel VT techonology.

I don't have VT and I don't know about XEON, but AFAIK there is a output
while booting Xen that shows processor flags and you should see it there.
Moreover, you need to have a VT-enabled bios with Intel processors, so have
a look there.

> If it is not possible, Is there any way of doing windows 
> virtualization i can try?

Bochs, VMWare, etc. Not with pure Xen without VT.


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