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Re: [Xen-users] Poor hard disk performance on xen-3/dom0

To: "Eric S. Johansson" <esj@xxxxxxxxxx>
Subject: Re: [Xen-users] Poor hard disk performance on xen-3/dom0
From: Jayesh Salvi <jayeshsalvi@xxxxxxxxx>
Date: Sat, 31 Dec 2005 13:18:40 -0600
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Thanks Ian for the comment on -xen. But if -xen kernel has more drivers then why is the size of vmlinuz small for it? Here is the comparision between sizes of vmlinuz:

jayesh@sam:~/xen$ ls -lh linux-2.6.12-xen/vmlinuz
-rw-r--r--  1 root root 1.6M 2005-12-17 11:16 linux-2.6.12-xen/vmlinuz
jayesh@sam:~/xen$ ls -lh linux-2.6.12-xen0/vmlinuz
-rw-r--r--  1 root root 2.2M 2005-12-17 11:57 linux-2.6.12-xen0/vmlinuz
jayesh@sam:~/xen$ ls -lh linux-2.6.12-xenU/vmlinuz
-rw-r--r--  1 root root 1.2M 2005-12-17 12:00 linux-2.6.12-xenU/vmlinuz

Shouldn't vmlinuz image of -xen be bigger if it has more drivers in-built than -xen0/U ?

I am having problem (previously discussed at http://lists.xensource.com/archives/html/xen-users/2005-12/msg00533.html) getting Xen started on Ubuntu 5.10 (I did it successfully on RHFC4). The boot process freezes after loading initrd. Ubuntu doesn't have mkinitrd by default, so I am using mkinitramfs. I don't know if it is initrd that is causing problem. So if I could boot without using initrd, that might solve my problem. Right now if I don't use initrd the boot process just freezes.

Thanks for your help.

On 12/30/05, Eric S. Johansson <esj@xxxxxxxxxx> wrote:
Ian Pratt wrote:
> I know everyone always ignores me whenever I say this, but users really
> should be using the -xen kernel rather than -xen0/U. The latter two are
> just to make build times quicker for developers. The -xen kernel has way
> more drivers, though built as modules, so you'll need to make an initrd.


section 2.4.2 building from source

unless I'm missing something, the official docs say nothing about a -xen
kernel (and modules).  what are more appropriate instructions for building?

--- eric

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